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

done Critical Thinking Total Questions - 23

• question_answer1)
  In which of the following acid, which acid has oxidation reduction and complex formation properties [UPSEAT 2001]
  A)
                  \[HN{{O}_{3}}\]                        done clear
  B)
                  \[{{H}_{2}}S{{O}_{4}}\] done clear
  C)
                  \[HCl\]   done clear
  D)
                  \[HN{{O}_{2}}\] done clear
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• question_answer2)
  The compound which could not act both as oxidising as well as reducing agent is               [IIT Screening 1991]
  A)
                  \[S{{O}_{2}}\]    done clear
  B)
                  \[Mn{{O}_{2}}\] done clear
  C)
                  \[A{{l}_{2}}{{O}_{3}}\]   done clear
  D)
                  \[CrO\] done clear
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• question_answer3)
  \[{{H}_{2}}S\] acts only as a reducing agent while \[S{{O}_{2}}\]can act both as a reducing and oxidizing agent because                 [AMU 1999]
  A)
  \[S\]in \[{{H}_{2}}S\]has - 2 oxidation state done clear
  B)
  \[S\]in \[S{{O}_{2}}\]has oxidation state + 4 done clear
  C)
  Hydrogen in \[{{H}_{2}}S\]more +ve than oxygen done clear
  D)
  Oxygen is more - ve in \[S{{O}_{2}}\] done clear
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• question_answer4)
  Of all the three common mineral acids, only sulphuric acid is found to be suitable for making the solution acidic because                                 [Kurukshetra CEE 2002]
  A)
                  It does not react with \[KMn{{O}_{4}}\] or the reducing agent    done clear
  B)
                  Hydrochloric acid reacts with \[KMn{{O}_{4}}\] done clear
  C)
                  Nitric acid is an oxidising agent which reacts with reducing agent done clear
  D)
                  All of the above are correct done clear
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• question_answer5)
  For \[{{H}_{3}}P{{O}_{3}}\] and \[{{H}_{3}}P{{O}_{4}}\] the correct choice is [IIT Screening 2003]
  A)
                  \[{{H}_{3}}P{{O}_{3}}\] is dibasic and reducing done clear
  B)
                  \[{{H}_{3}}P{{O}_{3}}\] is dibasic and non-reducing done clear
  C)
                  \[{{H}_{3}}P{{O}_{4}}\] is tribasic and reducing done clear
  D)
                  \[{{H}_{3}}P{{O}_{3}}\]  is tribasic and non-reducing done clear
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• question_answer6)
  Match List I with List II and select the correct answer using the codes given below the lists  

  	List I (Compound)		List II (Oxidation state of N)
  A	\[N{{O}_{2}}\]	1	+5
  B	\[HNO\]	2	-3
  C	\[N{{H}_{3}}\]	3	+4
  D	\[{{N}_{2}}{{O}_{5}}\]	4	+1

   
  A)
  A-2         B-3        C-4           D-1 done clear
  B)
  A-3         B-1        C-2           D-4 done clear
  C)
  A-3         B-4        C-2           D-1 done clear
  D)
  A-2         B-3        C-1           D-4 done clear
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• question_answer7)
  \[{{M}^{+3}}\] ion loses \[3{{e}^{-}}\]. Its oxidation number will be [CPMT 2002]
  A)
                  0              done clear
  B)
                  + 3 done clear
  C)
                  + 6          done clear
  D)
                  ? 3 done clear
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• question_answer8)
  In the reaction \[Zn+2{{H}^{+}}+2C{{l}^{-}}\to Z{{n}^{2+}}+2C{{l}^{-}}+{{H}_{2}}\], the spectator ion is    [AIIMS 2001]
  A)
                  \[C{{l}^{-}}\]       done clear
  B)
                  \[Z{{n}^{2+}}\] done clear
  C)
                  \[{{H}^{+}}\]      done clear
  D)
                  All of these done clear
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• question_answer9)
  The oxidation number of sulphur in \[{{H}_{2}}{{S}_{2}}{{O}_{7}}\] and iron in \[{{K}_{4}}Fe{{(CN)}_{6}}\] is respectively       [AIIMS 2000]
  A)
                  + 6 and + 2 done clear
  B)
                  + 2 and  + 2 done clear
  C)
                  + 8 and + 2          done clear
  D)
                  + 6 and  + 4 done clear
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• question_answer10)
  Oxidation number of oxygen in potassium super oxide \[(K{{O}_{2}})\] is             [UPSEAT 1999, 2002]
  A)
  - 2          done clear
  B)
  - 1 done clear
  C)
  - 1/2      done clear
  D)
  - 1/4 done clear
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• question_answer11)
  One mole of \[{{N}_{2}}{{H}_{4}}\] loses 10 mol of electrons to form a new compound Y. Assuming that all nitrogen appear in the new compound, what is the oxidation state of \[{{N}_{2}}\]in Y ? (There is no change in the oxidation state of hydrogen) [IIT 1981; Pb. PMT 1998]
  A)
  + 3          done clear
  B)
  - 3 done clear
  C)
  - 1          done clear
  D)
  + 5 done clear
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• question_answer12)
  Amongst the following identify the species with an atom in + 6 oxidation state   [IIT Screening 2000]
  A)
                  \[MnO_{4}^{-}\]              done clear
  B)
                  \[Cr(CN)_{6}^{3-}\] done clear
  C)
                  \[NiF_{6}^{2-}\]                done clear
  D)
                  \[Cr{{O}_{2}}C{{l}_{2}}\] done clear
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• question_answer13)
  In which of the following compounds, is the oxidation number of iodine is fractional       [BVP 2003]
  A)
                  \[I{{F}_{3}}\]      done clear
  B)
                  \[I{{F}_{2}}\] done clear
  C)
                  \[I_{3}^{-}\]       done clear
  D)
                  \[I{{F}_{7}}\] done clear
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• question_answer14)
  The compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superconductivity has copper in oxidation state ........ Assume that the rare earth element Yttrium is in its usual \[+\,3\] oxidation state [IIT 1994]
  A)
                  3/7         done clear
  B)
                  7/3 done clear
  C)
                  3              done clear
  D)
                  7 done clear
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• question_answer15)
  The oxidation number of sulphur in \[{{S}_{8}},\,{{S}_{2}}{{F}_{2}},\,{{H}_{2}}S\] respectively, are            [IIT 1999]
  A)
  0, +1 and - 2       done clear
  B)
  + 2, +1 and - 2 done clear
  C)
  0, + 1 and + 2      done clear
  D)
  - 2, + 1 and - 2 done clear
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• question_answer16)
  Which one of the following reactions is not an example of redox reaction             [Kurukshetra CEE 1998]
  A)
                  \[C{{l}_{2}}+2{{H}_{2}}O+S{{O}_{2}}\to 4{{H}^{+}}+S{{O}^{4-}}+2C{{l}^{-}}\] done clear
  B)
                  \[C{{u}^{++}}+Zn\to Z{{n}^{++}}+Cu\] done clear
  C)
                  \[2{{H}_{2}}+{{O}_{2}}\to 2{{H}_{2}}O\] done clear
  D)
                  \[HCl+{{H}_{2}}O\to {{H}_{3}}{{O}^{-}}+C{{l}^{-}}\] done clear
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• question_answer17)
  For the reactions, \[C+{{O}_{2}}\to C{{O}_{2}};\Delta H=-393J\] \[2\,\,Zn+{{O}_{2}}\to 2\,\,ZnO;\Delta H=-412J\]                              [AIEEE 2002]
  A)
                  Carbon can oxidise \[Zn\]             done clear
  B)
                  Oxidation of carbon is not feasible done clear
  C)
                  Oxidation of \[Zn\]is not feasible done clear
  D)
                  \[Zn\] can oxidise carbon done clear
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• question_answer18)
  In the reaction \[{{B}_{2}}{{H}_{6}}+2KOH+2X\to 2Y+6{{H}_{2}},\] X and Y are respectively           [EAMCET 2003]
  A)
                  \[{{H}_{2}}\],\[{{H}_{3}}B{{O}_{3}}\]       done clear
  B)
                  \[HCl\],\[KB{{O}_{3}}\] done clear
  C)
                  \[{{H}_{2}}O,\,\,KB{{O}_{3}}\]    done clear
  D)
                  \[{{H}_{2}}O\],\[KB{{O}_{2}}\] done clear
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• question_answer19)
  In a balanced equation \[{{H}_{2}}S{{O}_{4}}+x\,HI\to {{H}_{2}}S+y\,{{I}_{2}}+z\,{{H}_{2}}O\], the values of x, y, z are                 [EAMCET 2003]
  A)
                  x = 3, y = 5, z = 2 done clear
  B)
                  x = 4, y = 8, z = 5 done clear
  C)
                  x = 8, y = 4, z = 4 done clear
  D)
                  x = 5, y = 3, z = 4 done clear
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• question_answer20)
  Which of the following can act as an acid and as a base [AMU 1999]
  A)
                  \[HClO_{3}^{-}\]               done clear
  B)
                  \[{{H}_{2}}PO_{4}^{-}\] done clear
  C)
                  \[H{{S}^{-}}\]     done clear
  D)
                  All of these done clear
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• question_answer21)
  \[MnO_{4}^{2-}\] (1 mole) in neutral aqueous medium is disproportionate to     [AIIMS 2003]
  A)
                  2/3 mole of \[MnO_{4}^{-}\] and 1/3 mole of\[Mn{{O}_{2}}\] done clear
  B)
                  1/3 mole of \[MnO_{4}^{-}\] and 2/3 mole of \[Mn{{O}_{2}}\] done clear
  C)
                  1/3 mole of \[M{{n}_{2}}{{O}_{7}}\]and 1/3 mole of \[Mn{{O}_{2}}\] done clear
  D)
                  2/3 mole of \[M{{n}_{2}}{{O}_{7}}\] and 1/3 mole of \[Mn{{O}_{2}}\] done clear
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• question_answer22)
  The conductivity of a saturated solution of \[BaS{{O}_{4}}\] is \[3.06\times {{10}^{-6}}\,oh{{m}^{-1}}\,c{{m}^{-1}}\] and its equivalent conductance is \[1.53\,oh{{m}^{-1}}\,c{{m}^{-1}}\,equivalen{{t}^{-1}}\]. The \[{{K}_{sp}}\] of the \[BaS{{O}_{4}}\] will be [KCET 1996]
  A)
                  \[4\,\times {{10}^{-12}}\]             done clear
  B)
                  \[2.5\times {{10}^{-9}}\] done clear
  C)
                  \[2.5\times {{10}^{-13}}\]             done clear
  D)
                  \[4\times {{10}^{-6}}\] done clear
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• question_answer23)
  When \[Mn{{O}_{2}}\] is fused with KOH, a coloured compound is formed, the product and its colour is                [IIT Screening 2003]
  A)
                  \[{{K}_{2}}Mn{{O}_{4}}\], purple green done clear
  B)
                  \[KMn{{O}_{4}}\], purple done clear
  C)
                  \[M{{n}_{2}}{{O}_{3}}\], brown done clear
  D)
                  \[M{{n}_{3}}{{O}_{4}}\]black done clear
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