JEE Main & Advanced Chemistry Redox Reactions / रेडॉक्स अभिक्रियाएँ Question Bank

done Oxidation number and Oxidation state Total Questions - 113

• question_answer1)
  The oxidation number of C in \[C{{O}_{2}}\]is     [MP PET 2001]
  A)
  -2          done clear
  B)
  + 2 done clear
  C)
  -4          done clear
  D)
  + 4 done clear
  View Solution play_arrow

• question_answer2)
  The oxidation number of \[As\] is            [RPMT 1997]
  A)
                  + 2 and + 3          done clear
  B)
                  + 3 and + 5 done clear
  C)
                  + 3 and + 4          done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer3)
  The oxidation number of Ba in barium peroxide is [Pb. PMT 2002]
  A)
                  + 6          done clear
  B)
                  + 2 done clear
  C)
                  1              done clear
  D)
                  + 4 done clear
  View Solution play_arrow

• question_answer4)
  \[HN{{O}_{2}}\] acts both as reductant and oxidant, while \[HN{{O}_{3}}\] acts only as oxidant. It is due to their                 [AIIMS  2000]
  A)
                  Solubility ability done clear
  B)
                  Maximum oxidation number done clear
  C)
                  Minimum oxidation number done clear
  D)
                  Minimum number of valence electrons done clear
  View Solution play_arrow

• question_answer5)
  Chlorine is in +1 oxidation state in [MP PMT 1981; NCERT 1974; CPMT 1971, 78]
  A)
                  \[HCl\]  done clear
  B)
                  \[HCl{{O}_{4}}\] done clear
  C)
                  \[ICl\]    done clear
  D)
                  \[C{{l}_{2}}O\] done clear
  View Solution play_arrow

• question_answer6)
  The valency of Cr in the complex \[{{[Cr{{({{H}_{2}}O)}_{4}}C{{l}_{2}}]}^{+}}\] [MP PMT 2000]
  A)
                  1              done clear
  B)
                  3 done clear
  C)
                  5              done clear
  D)
                  6 done clear
  View Solution play_arrow

• question_answer7)
  In the conversion \[B{{r}_{2}}\,\to \,BrO_{3}^{-},\] the oxidation state of bromine changes from [EAMCET 1990; AMU 1999; RPMT 2002]
  A)
  - 1 to - 1              done clear
  B)
  0 to - 1 done clear
  C)
  0 to + 5 done clear
  D)
  0 to - 5 done clear
  View Solution play_arrow

• question_answer8)
  In the chemical reaction \[C{{l}_{2}}+{{H}_{2}}S\to 2HCl+S\], the oxidation number of sulphur changes from       [MP PMT 1999]
  A)
  0 to 2     done clear
  B)
  2 to 0 done clear
  C)
  - 2 to 0 done clear
  D)
  - 2  to - 1 done clear
  View Solution play_arrow

• question_answer9)
  Oxidation number of cobalt in \[K[Co{{(CO)}_{4}}]\] is [KCET 1996]
  A)
  + 1          done clear
  B)
  + 3 done clear
  C)
  -1          done clear
  D)
  -3 done clear
  View Solution play_arrow

• question_answer10)
  When \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] is converted to \[{{K}_{2}}Cr{{O}_{4}},\] the change in the oxidation state of chromium is       [NCERT 1981]
  A)
                  0              done clear
  B)
                  6 done clear
  C)
                  4              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer11)
  The oxidation number of chlorine in \[HOCl\]
  A)
  -1          done clear
  B)
  0 done clear
  C)
  + 1          done clear
  D)
  + 2 done clear
  View Solution play_arrow

• question_answer12)
  Oxidation number of \[S\]in \[{{S}^{2-}}\]is        [CPMT 1979]
  A)
  - 2          done clear
  B)
  0 done clear
  C)
  - 6          done clear
  D)
  + 2 done clear
  View Solution play_arrow

• question_answer13)
  Oxidation number of \[N\] in \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] is             [CPMT 1996]
  A)
  - 1 / 3    done clear
  B)
  - 1 done clear
  C)
  + 1          done clear
  D)
  -  3 done clear
  View Solution play_arrow

• question_answer14)
  In which compound, oxidation state of nitrogen is 1 [MP PMT 1989]
  A)
                  \[NO\]  done clear
  B)
                  \[{{N}_{2}}O\] done clear
  C)
                  \[N{{H}_{2}}OH\]             done clear
  D)
                  \[{{N}_{2}}{{H}_{4}}\] done clear
  View Solution play_arrow

• question_answer15)
  Oxidation number of nickel in \[Ni{{(CO)}_{4}}\] [AIIMS 1984; MNR 1985; CPMT 1997; MP PET/PMT 1998; AMU 2000; 01]
  A)
  0              done clear
  B)
  + 4 done clear
  C)
  - 4          done clear
  D)
  + 2 done clear
  View Solution play_arrow

• question_answer16)
  The oxidation number of sulphur in \[{{H}_{2}}S{{O}_{4}}\]is [CPMT 1979Pb. CET 2002]
  A)
  -2          done clear
  B)
  + 2 done clear
  C)
  + 4          done clear
  D)
  + 6 done clear
  View Solution play_arrow

• question_answer17)
  Oxidation state of chlorine in perchloric acid is [EAMCET 1989]
  A)
  -1          done clear
  B)
  0 done clear
  C)
  -7          done clear
  D)
  + 7 done clear
  View Solution play_arrow

• question_answer18)
  Oxidation number of \[N\] in \[HN{{O}_{3}}\] is [BHU 1997]
  A)
  - 3.5      done clear
  B)
  + 3.5 done clear
  C)
  - 3,  +5  done clear
  D)
  + 5 done clear
  View Solution play_arrow

• question_answer19)
  The oxidation number of \[Mn\] in \[MnO_{4}^{-1}\] is
  A)
  + 7          done clear
  B)
  - 5 done clear
  C)
  + 6          done clear
  D)
  + 5 done clear
  View Solution play_arrow

• question_answer20)
  \[S{{n}^{++}}\]loses two electrons in a reaction. What will be the oxidation number of tin after the reaction
  A)
  + 2          done clear
  B)
  Zero done clear
  C)
  + 4          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer21)
  The oxidation state of \[Mn\] in \[{{K}_{2}}Mn{{O}_{4}}\] [CPMT 1982, 83, 84; DPMT 1982; NCERT 1973; AMU 2000]
  A)
  + 2          done clear
  B)
  + 7 done clear
  C)
  - 2          done clear
  D)
  + 6 done clear
  View Solution play_arrow

• question_answer22)
  Oxidation number of oxygen in \[{{O}_{2}}\] molecule is [CPMT 1984]
  A)
  + 1          done clear
  B)
  0 done clear
  C)
  + 2          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer23)
  Maximum oxidation state of  Cr is            [RPMT 2002]
  A)
                  3              done clear
  B)
                  4 done clear
  C)
                  6              done clear
  D)
                  7 done clear
  View Solution play_arrow

• question_answer24)
  In which of the following compound transition metal has zero oxidation state     [CBSE PMT 1999; BHU 2000]
  A)
                  \[Cr{{O}_{5}}\]   done clear
  B)
                  \[N{{H}_{2}}.N{{H}_{2}}\] done clear
  C)
                  \[NOCl{{O}_{4}}\]                  done clear
  D)
                  \[[Fe{{(CO)}_{5}}]\] done clear
  View Solution play_arrow

• question_answer25)
  Carbon is in the lowest oxidation state in [NCERT 1979; MH CET 1999]
  A)
                  \[C{{H}_{4}}\]    done clear
  B)
                  \[CC{{l}_{4}}\] done clear
  C)
                  \[C{{F}_{4}}\]     done clear
  D)
                  \[C{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer26)
  Oxidation number of carbon in \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] is [CPMT 1982]
  A)
  + 4          done clear
  B)
  + 3 done clear
  C)
  + 2          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer27)
  The oxidation number of \[Pt\]in \[{{[Pt({{C}_{2}}{{H}_{4}})\,C{{l}_{3}}]}^{-}}\] is [MNR 1993]
  A)
                  + 1          done clear
  B)
                  + 2 done clear
  C)
                  + 3          done clear
  D)
                  + 4 done clear
  View Solution play_arrow

• question_answer28)
  The oxidation number of carbon in \[C{{H}_{2}}C{{l}_{2}}\] is [CPMT 1976; Pb. PET 1999; AFMC 2004]
  A)
                  0              done clear
  B)
                  + 2 done clear
  C)
                  \[-2\]     done clear
  D)
                  + 4 done clear
  View Solution play_arrow

• question_answer29)
  The oxidation states of phosphorus vary from [CPMT 1976]
  A)
  - 3 to +5               done clear
  B)
  - 1 to +1 done clear
  C)
  - 3 to +3               done clear
  D)
  - 5 to +1 done clear
  View Solution play_arrow

• question_answer30)
  The process in which oxidation number increases is known as [CPMT 1976]
  A)
                  Oxidation done clear
  B)
                  Reduction done clear
  C)
                  Auto-oxidation done clear
  D)
                  None of the above done clear
  View Solution play_arrow

• question_answer31)
  The oxidation number of  S in \[{{H}_{2}}{{S}_{2}}{{O}_{8}}\]is    [MP PET 2002]
  A)
                  + 2          done clear
  B)
                  + 4 done clear
  C)
                  + 6          done clear
  D)
                  + 7 done clear
  View Solution play_arrow

• question_answer32)
  The oxidation state of nitrogen in \[{{N}_{3}}H\]is [NCERT 1977, 81]
  A)
                  \[+\frac{1}{3}\] done clear
  B)
                  + 3 done clear
  C)
                  \[-1\]     done clear
  D)
                  \[-\frac{1}{3}\] done clear
  View Solution play_arrow

• question_answer33)
  Which of the following statements is correct       [AFMC 1997]
  A)
                  Hydrogen has oxidation number \[-1\] and \[+\,1\] done clear
  B)
                  Hydrogen has same electronegativity as halogens done clear
  C)
                  Hydrogen will not be liberated at anode done clear
  D)
                  Hydrogen has same ionization potential as alkali metals done clear
  View Solution play_arrow

• question_answer34)
  The oxidation state of \[Cr\] in \[{{[Cr{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]}^{+}}\] is [AIEEE 2005]
  A)
                  +3           done clear
  B)
                  +2 done clear
  C)
                  +1           done clear
  D)
                  0 done clear
  View Solution play_arrow

• question_answer35)
  Sulphur has highest oxidation state in [EAMCET 1991]
  A)
                  \[S{{O}_{2}}\]    done clear
  B)
                  \[{{H}_{2}}S{{O}_{4}}\] done clear
  C)
                  \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] done clear
  D)
                  \[N{{a}_{2}}{{S}_{4}}{{O}_{6}}\] done clear
  View Solution play_arrow

• question_answer36)
  The oxidation number of \[Fe\] and \[S\] in iron pyrites are [RPMT 1997]
  A)
  4, - 2     done clear
  B)
  2, - 1 done clear
  C)
  3, - 1.5  done clear
  D)
  3, - 1 done clear
  View Solution play_arrow

• question_answer37)
  The oxidation number of nitrogen in \[NO_{3}^{-}\] is [CPMT 1982]
  A)
  - 1          done clear
  B)
  + 2 done clear
  C)
  + 3          done clear
  D)
  + 5 done clear
  View Solution play_arrow

• question_answer38)
  Oxidation state of elemental carbon is   [MNR 1983]
  A)
                  0              done clear
  B)
                  1 done clear
  C)
                  2              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer39)
  The sum of the oxidation numbers of all the carbons in \[{{C}_{6}}{{H}_{5}}CHO\] is         [EAMCET 1986]
  A)
  + 2          done clear
  B)
  0 done clear
  C)
  + 4          done clear
  D)
  - 4 done clear
  View Solution play_arrow

• question_answer40)
  Which one of the following has the highest oxidation number of iodine [CPMT 1982]
  A)
                  \[K{{I}_{3}}\]      done clear
  B)
                  \[KI\] done clear
  C)
                  \[I{{F}_{5}}\]      done clear
  D)
                  \[KI{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer41)
  The oxidation number of  N in \[{{N}_{2}}H_{5}^{+}\]     [Pb. PMT 2001]
  A)
  - 3          done clear
  B)
  (- 2) done clear
  C)
  - 1          done clear
  D)
  + 2 done clear
  View Solution play_arrow

• question_answer42)
  In which of the following compounds the oxidation number of carbon is maximum
  A)
                  \[HCHO\]             done clear
  B)
                  \[CHC{{l}_{3}}\] done clear
  C)
                  \[C{{H}_{3}}OH\]              done clear
  D)
                  \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\] done clear
  View Solution play_arrow

• question_answer43)
  The oxidation state of chlorine in \[KCl{{O}_{4}}\] is         [CPMT 1985]
  A)
  - 1          done clear
  B)
  + 1 done clear
  C)
  + 7          done clear
  D)
  - 7 done clear
  View Solution play_arrow

• question_answer44)
  The oxidation state of \[I\] in \[{{H}_{4}}IO_{6}^{-}\] is  [CBSE PMT 1994]
  A)
  + 7          done clear
  B)
  + 5 done clear
  C)
  + 1          done clear
  D)
  - 1 done clear
  View Solution play_arrow

• question_answer45)
  An element which never has a positive oxidation number in any of its compounds           [AIIMS 1981]
  A)
                  Boron    done clear
  B)
                  Oxygen done clear
  C)
                  Chlorine               done clear
  D)
                  Fluorine done clear
  View Solution play_arrow

• question_answer46)
  In an oxidation process, oxidation number           [CPMT 1976]
  A)
                  Decreases           done clear
  B)
                  Increases done clear
  C)
                  Does not change done clear
  D)
                  First increases then decreases done clear
  View Solution play_arrow

• question_answer47)
  If \[HN{{O}_{3}}\] changes into \[{{N}_{2}}O\], the oxidation number is changed by        [BHU 1997; AFMC 2001]
  A)
  + 2          done clear
  B)
  - 1 done clear
  C)
  0              done clear
  D)
  + 4 done clear
  View Solution play_arrow

• question_answer48)
  The characteristic oxidation number of atoms in free metals is   [NCERT 1975]
  A)
                  Minus one          done clear
  B)
                  Any number done clear
  C)
                  One       done clear
  D)
                  Zero done clear
  View Solution play_arrow

• question_answer49)
  In which one of the following changes there are transfer of five electrons            [NCERT 1982]
  A)
                  \[MnO_{4}^{-}\to \,M{{n}^{2+}}\]           done clear
  B)
                  \[CrO_{4}^{2}\to \,C{{r}^{3+}}\] done clear
  C)
                  \[MnO_{4}^{2-}\to \,Mn{{O}_{2}}\]        done clear
  D)
                  \[C{{r}_{2}}O_{7}^{2-}\,\to \,2C{{r}^{3+}}\] done clear
  View Solution play_arrow

• question_answer50)
  Oxidation number of \[C\] in \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\]is  [KCET 1992]
  A)
  + 6          done clear
  B)
  - 6 done clear
  C)
  0              done clear
  D)
  + 4 done clear
  View Solution play_arrow

• question_answer51)
  In which of the following compounds iron has lowest oxidation state      [MNR 1984]
  A)
                  \[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] done clear
  B)
                  \[{{K}_{4}}Fe{{(CN)}_{6}}\] done clear
  C)
                  \[Fe{{(CO)}_{5}}\] done clear
  D)
                  \[F{{e}_{2}}O\] done clear
  E)
                  \[{{K}_{2}}Fe{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer52)
  The oxidation number of hydrogen in \[M{{H}_{2}}\]is [CPMT 1976]
  A)
  + 1          done clear
  B)
  - 1 done clear
  C)
  + 2          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer53)
  Oxidation number of iodine varies from                [CPMT 1982]
  A)
  - 1 to +1               done clear
  B)
  - 1 to +7 done clear
  C)
  +3 to +5                done clear
  D)
  - 1 to +5 done clear
  View Solution play_arrow

• question_answer54)
  When \[S{{O}_{2}}\] is passed through acidic solution of potassium dichromate, then chromium sulphate is formed. Change in valency of chromium is             [CPMT 1979]
  A)
                  +4 to +2                done clear
  B)
                  +5 to +3 done clear
  C)
                  +6 to +3                done clear
  D)
                  +7 to +2 done clear
  View Solution play_arrow

• question_answer55)
  The oxidation states of the most electronegative element in the products of the reaction of \[Ba{{O}_{2}}\]with dilute \[{{H}_{2}}S{{O}_{4}}\] are [IIT 1991; CBSE PMT 1992; BHU 2000]
  A)
  0 and - 1              done clear
  B)
  - 1 and  - 2 done clear
  C)
  - 2 and 0              done clear
  D)
  - 2 and + 1 done clear
  View Solution play_arrow

• question_answer56)
  The highest oxidation state of \[Mn\] is shown by [MNR 1983; RPMT 1999]
  A)
                  \[{{K}_{2}}Mn{{O}_{4}}\]              done clear
  B)
                  \[KMn{{O}_{4}}\] done clear
  C)
                  \[Mn{{O}_{2}}\]               done clear
  D)
                  \[M{{n}_{2}}{{O}_{2}}\] done clear
  E)
                  \[MnO\] done clear
  View Solution play_arrow

• question_answer57)
  The oxidation number of carbon in \[C{{H}_{2}}O\] is [IIT 1982; EAMCET 1985; MNR 1990; UPSEAT 2001 CPMT 1997, 2004]
  A)
  - 2          done clear
  B)
  + 2 done clear
  C)
  0              done clear
  D)
  + 4 done clear
  View Solution play_arrow

• question_answer58)
  Oxidation state of oxygen in hydrogen peroxide is [DPMT 1984; 91; CPMT 1988; MNR 1994; UPSEAT 2001; RPMT 2002; JEE Orissa 2004]
  A)
  - 1          done clear
  B)
  + 1 done clear
  C)
  0              done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer59)
  The oxidation number of \[Cr\] in \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]is [CPMT 1981, 85, 90, 93, 99; KCET 1992; BHU 1988, 98; AFMC 1991, 99; EAMCET 1986; MP PMT 1996, 99, 2002; MP PET/PMT 1998; Bihar CEE 1995; RPET 2000]
  A)
  +6           done clear
  B)
  - 7 done clear
  C)
  +2           done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer60)
  In which of the following compounds transition metal is in oxidation state zero  [NCERT 1982]
  A)
                  \[[Co{{(N{{H}_{3}})}_{6}}]C{{l}_{2}}\]      done clear
  B)
                  \[[Fe{{({{H}_{2}}O)}_{6}}S{{O}_{4}}]\] done clear
  C)
                  \[[Ni{{(CO)}_{4}}]\]         done clear
  D)
                  \[[Fe{{({{H}_{2}}O)}_{3}}]{{(OH)}_{2}}\] done clear
  View Solution play_arrow

• question_answer61)
  Oxidation number of osmium \[(Os)\] in \[Os{{O}_{4}}\]is                                                                 [AIIMS 1999]
  A)
                  + 4          done clear
  B)
                  + 6 done clear
  C)
                  + 7          done clear
  D)
                  + 8 done clear
  View Solution play_arrow

• question_answer62)
  The atomic number of an element which shows the oxidation state of + 3 is        [CPMT 1989, 94]
  A)
                  13           done clear
  B)
                  32 done clear
  C)
                  33           done clear
  D)
                  17 done clear
  View Solution play_arrow

• question_answer63)
  The oxidation number of iron in the compound \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] is [NCERT 1976; MNR 1986; AIIMS 2000]
  A)
                  + 6          done clear
  B)
                  + 4 done clear
  C)
                  + 3          done clear
  D)
                  + 2 done clear
  View Solution play_arrow

• question_answer64)
  The brown ring complex compound is formulated as \[[Fe{{({{H}_{2}}O)}_{5}}NO]\,S{{O}_{4}}.\] The oxidation state of iron is [EAMCET 1987; IIT 1987; MP PMT 1994; AIIMS 1997; DCE 2000]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
                  0 done clear
  View Solution play_arrow

• question_answer65)
  Oxidation state of oxygen in \[{{F}_{2}}O\]is [BHU 1982; UPSEAT 2001; MH CET 2002]
  A)
                  + 1          done clear
  B)
                  + 2 done clear
  C)
                  \[-1\]     done clear
  D)
                  \[-2\] done clear
  View Solution play_arrow

• question_answer66)
  Phosphorus has the oxidation state of +3 in [NCERT 1982; RPMT 1999]
  A)
                  Orthophosphoric acid    done clear
  B)
                  Phosphorus acid done clear
  C)
                  Metaphosphoric acid     done clear
  D)
                  Pyrophosphoric acid done clear
  View Solution play_arrow

• question_answer67)
  Oxidation number of \[P\]in \[M{{g}_{2}}{{P}_{2}}{{O}_{7}}\]is [CPMT 1989; MP PMT 1995]
  A)
  + 3          done clear
  B)
  + 2 done clear
  C)
  + 5          done clear
  D)
  - 3 done clear
  View Solution play_arrow

• question_answer68)
  The oxidation state of nitrogen is highest in                 [MP PMT 2001; BHU 2002]
  A)
                  \[{{N}_{3}}H\]   done clear
  B)
                  \[N{{H}_{2}}OH\] done clear
  C)
                  \[{{N}_{2}}{{H}_{4}}\]    done clear
  D)
                  \[N{{H}_{3}}\] done clear
  View Solution play_arrow

• question_answer69)
  Oxidation number of \[P\]in \[K{{H}_{2}}P{{O}_{2}}\] is [CPMT 1987; MH CET 1999]
  A)
  + 1          done clear
  B)
  + 3 done clear
  C)
  + 5          done clear
  D)
  - 4 done clear
  View Solution play_arrow

• question_answer70)
  The most common oxidation state of an element is ?2. The number of electrons present in its outermost shell is [BHU 1983; NCERT 1974; CPMT 1977]
  A)
                  4              done clear
  B)
                  2 done clear
  C)
                  6              done clear
  D)
                  8 done clear
  View Solution play_arrow

• question_answer71)
  Sulphur has lowest oxidation number in [EAMCET 1993]
  A)
                  \[{{H}_{2}}S{{O}_{3}}\]  done clear
  B)
                  \[S{{O}_{2}}\] done clear
  C)
                  \[{{H}_{2}}S{{O}_{4}}\]  done clear
  D)
                  \[Ca,\,\,K,\,\,Li\] done clear
  View Solution play_arrow

• question_answer72)
  The oxidation number and covalency of sulphur in the sulphur molecule \[({{S}_{8}})\]are respectively  [NCERT 1977]
  A)
                  0 and 2  done clear
  B)
                  6 and 8 done clear
  C)
                  0 and 8  done clear
  D)
                  6 and 2 done clear
  View Solution play_arrow

• question_answer73)
  In ferrous ammonium sulphate oxidation number of \[Fe\]is [CPMT 1988]
  A)
  + 3          done clear
  B)
  + 2 done clear
  C)
  + 1          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer74)
  The oxidation number of nitrogen in \[N{{H}_{2}}OH\]is [NCERT 1981]
  A)
  + 1          done clear
  B)
  - 1 done clear
  C)
  - 3          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer75)
  The oxidation number of phosphorus in \[Ba{{({{H}_{2}}P{{O}_{2}})}_{2}}\] is [Kurukshetra CEE 1998; DCE 2004]
  A)
  - 1          done clear
  B)
  + 1 done clear
  C)
  + 2          done clear
  D)
  + 3 done clear
  View Solution play_arrow

• question_answer76)
  A compound is in its low oxidation state. Then its will be [DCE 2001]
  A)
                  Highly acidic done clear
  B)
                  Highly basic done clear
  C)
                  Highest oxidising property done clear
  D)
                  Half acidic, half basic done clear
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• question_answer77)
  The oxidation number and the electronic configuration of sulphur in \[{{H}_{2}}S{{O}_{4}}\]is     [KCET 2002]
  A)
                  + 4;\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}\]   done clear
  B)
                  + 2; \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{2}}\] done clear
  C)
                  + 3; \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{1}}\] done clear
  D)
                  + 6; \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\] done clear
  View Solution play_arrow

• question_answer78)
  The oxidation number of \[Mn\]in \[N{{O}_{2}}\]is                                                 [CPMT 1982, 83; EAMCET 1992, 93; RPET 1999]
  A)
  + 7          done clear
  B)
  - 7 done clear
  C)
  + 1          done clear
  D)
  - 1 done clear
  View Solution play_arrow

• question_answer79)
  Oxidation number of As atoms in \[{{H}_{3}}As{{O}_{4}}\]is [DPMT 2001]
  A)
  - 3          done clear
  B)
  + 4 done clear
  C)
  + 6          done clear
  D)
  + 5 done clear
  View Solution play_arrow

• question_answer80)
  In \[Xe{{O}_{3}}\] and \[Xe{{F}_{6}}\] the oxidation state of Xe is                                                                 [MP PET 2003]
  A)
                  + 4          done clear
  B)
                  + 6 done clear
  C)
                  + 1          done clear
  D)
                  + 3 done clear
  View Solution play_arrow

• question_answer81)
  Oxidation number of carbon in \[C{{H}_{3}}-Cl\] is                                                                 [MP PET 2000]
  A)
  - 3          done clear
  B)
  - 2 done clear
  C)
  - 1          done clear
  D)
  0 done clear
  View Solution play_arrow

• question_answer82)
  The oxidation state of \[Cr\] in \[C{{r}_{2}}O_{7}^{2-}\] is [BHU 2000; CPMT 2000]
  A)
  4              done clear
  B)
  - 6 done clear
  C)
  6                                                     done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer83)
  Oxidation state of ?S? in \[{{H}_{2}}S{{O}_{3}}\]  [RPET 2003]
  A)
                  + 3          done clear
  B)
                  + 6 done clear
  C)
                  + 4          done clear
  D)
                  + 2 done clear
  View Solution play_arrow

• question_answer84)
  Oxidation numbers of two \[Cl\]atoms in bleaching powder, \[CaOC{{l}_{2}}\] are
  A)
  - 1, - 1  done clear
  B)
  + 1, - 1 done clear
  C)
  + 1, + 1  done clear
  D)
  0, - 1 done clear
  View Solution play_arrow

• question_answer85)
  Select the compound in which chlorine is assigned the oxidation number +5        [NCERT 1984, 94]
  A)
                  \[HCl{{O}_{4}}\]                done clear
  B)
                  \[HCl{{O}_{2}}\] done clear
  C)
                  \[HCl{{O}_{3}}\]                done clear
  D)
                  \[HCl\] done clear
  View Solution play_arrow

• question_answer86)
  When \[KMn{{O}_{4}}\]is reduced with oxalic acid in acidic solution, the oxidation number of \[Mn\] changes from [MNR 1987; MP PET 2000; CBSE PMT 2000; UPSEAT 2000, 02; BHU 2003; AMU 2002]
  A)
                  7 to 4     done clear
  B)
                  6 to 4 done clear
  C)
                  7 to 2     done clear
  D)
                  4 to 2 done clear
  View Solution play_arrow

• question_answer87)
  Oxygen has oxidation states of +2 in the [NCERT 1973; DPMT 1983; MP PET 2000]
  A)
                  \[{{H}_{2}}{{O}_{2}}\]    done clear
  B)
                  \[C{{O}_{2}}\] done clear
  C)
                  \[{{H}_{2}}O\]   done clear
  D)
                  \[O{{F}_{2}}\] done clear
  View Solution play_arrow

• question_answer88)
  The element exhibiting most stable \[+\,2\] oxidation state among the following is          [IIT 1995]
  A)
                  \[Ag\]   done clear
  B)
                  \[Fe\] done clear
  C)
                  \[Sn\]    done clear
  D)
                  \[Pb\] done clear
  View Solution play_arrow

• question_answer89)
  Oxidation number of sulphur in \[{{S}_{2}}O_{3}^{2-}\]is              [CPMT 1979]
  A)
  - 2          done clear
  B)
  + 2 done clear
  C)
  + 6          done clear
  D)
  0 done clear
  View Solution play_arrow

• question_answer90)
  Carbon has zero oxidation number in                 [Kurukshetra CEE 2002]
  A)
                  \[CO\]   done clear
  B)
                  \[C{{H}_{4}}\] done clear
  C)
                  \[C{{H}_{2}}C{{l}_{2}}\] done clear
  D)
                  \[C{{H}_{3}}Cl\] done clear
  View Solution play_arrow

• question_answer91)
  Oxidation state of oxygen atom in potassium superoxide is [MNR 1988; NCERT 1980]
  A)
  0              done clear
  B)
  - 1 done clear
  C)
  \[-\tfrac{1}{2}\] done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer92)
  Oxidation number of \[S\]in \[{{S}_{2}}C{{l}_{2}}\] is
  A)
  + 1          done clear
  B)
  - 1 done clear
  C)
  + 6          done clear
  D)
  0 done clear
  View Solution play_arrow

• question_answer93)
  What is the oxidation number of sulphur in \[N{{a}_{2}}{{S}_{4}}{{O}_{6}}\] [AIIMS 1998; DCE 1999]
  A)
                  \[\frac{2}{3}\]    done clear
  B)
                  \[\frac{3}{2}\] done clear
  C)
                  \[\frac{3}{5}\]    done clear
  D)
                  \[\frac{5}{2}\] done clear
  View Solution play_arrow

• question_answer94)
  When \[CuS{{O}_{4}}\] reacts with \[KI\], the oxidation number of \[Cu\] changes by    [BHU 1997]
  A)
  0              done clear
  B)
  - 1 done clear
  C)
  1              done clear
  D)
  2 done clear
  View Solution play_arrow

• question_answer95)
  The oxidation number of \[N\]  in \[N{{H}_{4}}Cl\] is
  A)
  + 5          done clear
  B)
  + 3 done clear
  C)
  - 5          done clear
  D)
  - 3 done clear
  View Solution play_arrow

• question_answer96)
  In which reaction there is a change in valency [NCERT 1971; CPMT 1971]
  A)
                  \[2N{{O}_{2}}\,\to \,\,{{N}_{2}}{{O}_{4}}\] done clear
  B)
                  \[2N{{O}_{2}}+{{H}_{2}}O\,\to \,HN{{O}_{2}}+HN{{O}_{3}}\] done clear
  C)
                  \[N{{H}_{4}}OH\,\to \,NH_{4}^{+}+O{{H}^{-}}\] done clear
  D)
                  \[CaC{{O}_{3}}\,\to \,CaO+C{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer97)
  Oxidation state of \[Fe\] in \[F{{e}_{3}}{{O}_{4}}\] is [CBSE PMT 1999; AIIMS 2002]
  A)
                  \[\frac{3}{2}\]    done clear
  B)
                  \[\frac{4}{5}\] done clear
  C)
                  \[\frac{5}{4}\]    done clear
  D)
                  \[\frac{8}{3}\] done clear
  View Solution play_arrow

• question_answer98)
  Nitrogen show different oxidation states in the range   [Kerala (Med.) 2003]
  A)
  0 to +5  done clear
  B)
  - 3 to + 5 done clear
  C)
  - 5 to + 3              done clear
  D)
  - 3 to + 3 done clear
  View Solution play_arrow

• question_answer99)
  Oxidation number of \[Mn\] in \[{{K}_{2}}Mn{{O}_{4}}\] and \[MnS{{O}_{4}}\] are respectively [CPMT 1997]
  A)
                  + 7, + 2  done clear
  B)
                  + 6, + 2 done clear
  C)
                  + 5, + 2  done clear
  D)
                  + 2, + 6 done clear
  View Solution play_arrow

• question_answer100)
  Identify the element which can have highest oxidation numbers              [AIIMS 1996]
  A)
                  \[N\]     done clear
  B)
                  \[O\] done clear
  C)
                  \[Cl\] done clear
  D)
                  \[C\] done clear
  View Solution play_arrow

• question_answer101)
  What is the oxidation number of Co in \[[Co{{(N{{H}_{3}})}_{4}}ClN{{O}_{2}}]\] [BHU 1999]
  A)
                  + 2          done clear
  B)
                  + 3 done clear
  C)
                  + 4          done clear
  D)
                  + 5 done clear
  View Solution play_arrow

• question_answer102)
  The oxidation number of nickel in \[{{K}_{4}}[Ni{{(CN)}_{4}}]\] is [JIPMER 1999]
  A)
  - 2          done clear
  B)
  - 1 done clear
  C)
  + 2          done clear
  D)
  0 done clear
  View Solution play_arrow

• question_answer103)
  The oxidation number of fluorine in \[{{F}_{2}}O\] is [CPMT 1982; BHU 1982; EAMCET 1986]
  A)
  - 1          done clear
  B)
  + 1 done clear
  C)
  + 2          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer104)
  Oxidation number of \[Fe\]in \[{{K}_{3}}[Fe{{(CN)}_{6}}]\] is [AMU 1988]
  A)
                  + 2          done clear
  B)
                  + 3 done clear
  C)
                  + 1          done clear
  D)
                  + 4 done clear
  View Solution play_arrow

• question_answer105)
  Oxidation number of \[N\]in \[N{{H}_{3}}\]is [CPMT 1979; Pb CET 2004]
  A)
  - 3          done clear
  B)
  + 3 done clear
  C)
  0              done clear
  D)
  + 5 done clear
  View Solution play_arrow

• question_answer106)
  What is the net charge on ferrous ion     [AFMC 2004]
  A)
                  + 2          done clear
  B)
                  + 3 done clear
  C)
                  + 4          done clear
  D)
                  + 5 done clear
  View Solution play_arrow

• question_answer107)
  Which of the following elements never show positive oxidation number               [CPMT 2004]
  A)
                  \[O\]     done clear
  B)
                  \[Fe\] done clear
  C)
                  \[Ga\]   done clear
  D)
                  \[F\] done clear
  View Solution play_arrow

• question_answer108)
  The oxidation state shown by silicon when it combines with strongly electropositive metals is     [MH CET 2004]
  A)
  - 2          done clear
  B)
  - 4 done clear
  C)
  + 4          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer109)
  The oxidation number of sulphur in \[{{H}_{2}}S\] is [Pb. CET 2002]
  A)
  - 2          done clear
  B)
  + 3 done clear
  C)
  + 2          done clear
  D)
  - 3 done clear
  View Solution play_arrow

• question_answer110)
  Oxidation number of nitrogen in \[NaN{{O}_{2}}\] is [Pb. CET 2000]
  A)
  + 2          done clear
  B)
  + 3 done clear
  C)
  + 4          done clear
  D)
  - 3 done clear
  View Solution play_arrow

• question_answer111)
  Oxidation number of S in \[SO_{4}^{2-}\]             [BCECE 2005]
  A)
  + 6          done clear
  B)
  + 3 done clear
  C)
  + 2          done clear
  D)
  - 2 done clear
  View Solution play_arrow

• question_answer112)
  The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is   [AIEEE 2005]
  A)
                  +4           done clear
  B)
                  +6 done clear
  C)
                  +2           done clear
  D)
                  +3 done clear
  View Solution play_arrow

• question_answer113)
  The oxidation state of I in \[IP{{O}_{4}}\] is          [Orissa JEE 2005]
  A)
                  +1           done clear
  B)
                  +3 done clear
  C)
                  +5           done clear
  D)
                  +7 done clear
  View Solution play_arrow