JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank

done Atomic Molecular and Equivalent masses Total Questions - 63

• question_answer1)
  Which property of an element is always a whole number [MP PMT 1986]
  A)
                  Atomic weight        done clear
  B)
                  Equivalent weight done clear
  C)
                  Atomic number     done clear
  D)
                  Atomic volume done clear
  View Solution play_arrow

• question_answer2)
  Which one of the following properties of an element is not variable                                              [Bihar MADT 1981]
  A)
                  Valency  done clear
  B)
                  Atomic weight done clear
  C)
                  Equivalent weight done clear
  D)
                  All of these done clear
  View Solution play_arrow

• question_answer3)
  The modern atomic weight scale is based on [MP PMT 2002]
  A)
                  \[{{C}^{12}}\]    done clear
  B)
                  \[{{O}^{16}}\] done clear
  C)
                  \[{{H}^{1}}\]      done clear
  D)
                  \[{{C}^{13}}\] done clear
  View Solution play_arrow

• question_answer4)
  1 amu is equal to
  A)
                  \[\frac{1}{12}\text{of }C-12\]             done clear
  B)
                  \[\frac{1}{14}\text{of O-16}\] done clear
  C)
                  \[1g\text{ of }{{H}_{2}}\]   done clear
  D)
                  \[1.66\times {{10}^{-23}}\]kg done clear
  View Solution play_arrow

• question_answer5)
  Sulphur forms the chlorides\[{{S}_{2}}C{{l}_{2}}\text{ and }SC{{l}_{2}}\]. The equivalent mass of sulphur in \[SC{{l}_{2}}\]is [EAMCET 1985; Pb. CET 2001]
  A)
                  8 g/mole done clear
  B)
                  16 g/mole done clear
  C)
                  64.8 g/mole           done clear
  D)
                  32 g/mole done clear
  View Solution play_arrow

• question_answer6)
  The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with \[ZnS{{O}_{4}}.7{{H}_{2}}O\]. The atomic weight of M is                                                [IIT 1991]
  A)
                  40.3        done clear
  B)
                  36.3 done clear
  C)
                  24.3        done clear
  D)
                  11.3 done clear
  View Solution play_arrow

• question_answer7)
  When 100 ml of 1\[M\,NaOH\]solution and 10 ml of 10\[N\,{{H}_{2}}S{{O}_{4}}\]solution are mixed together, the resulting solution will be                                                [DPMT 1982]
  A)
                  Alkaline  done clear
  B)
                  Acidic done clear
  C)
                  Strongly acidic       done clear
  D)
                  Neutral done clear
  View Solution play_arrow

• question_answer8)
  In chemical scale, the relative mass of the isotopic mixture of oxygen atoms \[({{O}^{16}},\,{{O}^{17}},\,{{O}^{18}})\] is assumed to be equal to [Bihar MADT 1981]
  A)
                  16.002   done clear
  B)
                  16.00 done clear
  C)
                  17.00      done clear
  D)
                  11.00 done clear
  View Solution play_arrow

• question_answer9)
  For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be                                     [MP PET 1996]
  A)
                  More than the theoretical weight done clear
  B)
                  Less than the theoretical weight done clear
  C)
                  Same as the theoretical weight done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer10)
  1 mol of \[C{{H}_{4}}\]contains
  A)
                  \[6.02\times {{10}^{23}}\]atoms of H            done clear
  B)
                  4 g atom of Hydrogen          done clear
  C)
                  \[1.81\times {{10}^{23}}\]molecules of \[C{{H}_{4}}\] done clear
  D)
                  3.0 g of carbon done clear
  View Solution play_arrow

• question_answer11)
  In the reaction  \[2N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{I}_{2}}\to N{{a}_{2}}{{S}_{4}}{{O}_{6}}+2NaI\], the equivalent weight of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\](mol. wt. = M) is equal to
  A)
                  M             done clear
  B)
                  \[M/2\] done clear
  C)
                  \[M/3\]     done clear
  D)
                  \[M/4\] done clear
  View Solution play_arrow

• question_answer12)
  When potassium permanganate is titrated against ferrous ammonium sulphate, the equivalent weight of potassium permanganate is                                               [CPMT 1988]
  A)
                  Molecular weight /10            done clear
  B)
                  Molecular weight /5              done clear
  C)
                  Molecular weight /2              done clear
  D)
                  Molecular weight done clear
  View Solution play_arrow

• question_answer13)
  Boron has two stable isotopes, \[^{10}B\](19%) and \[^{11}B\](81%). The atomic mass that should appear for boron in the periodic table is                                                [CBSE PMT 1990]
  A)
                  10.8        done clear
  B)
                  10.2 done clear
  C)
                  11.2        done clear
  D)
                  10.0 done clear
  View Solution play_arrow

• question_answer14)
  What is the concentration of nitrate ions if equal volumes of 0.1 \[M\,AgN{{O}_{3}}\]and 0.1 \[M\,NaCl\]are mixed together [CPMT 1983; NCERT 1985]
  A)
                  0.1 M      done clear
  B)
                  0.2 M done clear
  C)
                  0.05 M    done clear
  D)
                  0.25 M done clear
  View Solution play_arrow

• question_answer15)
  Total number of atoms represented by the compound CuSO4.5H2O is      [BHU 2005]
  A)
                  27           done clear
  B)
                  21 done clear
  C)
                  5              done clear
  D)
                  8 done clear
  View Solution play_arrow

• question_answer16)
  74.5 g of a metallic chloride contain 35.5 g of chlorine. The equivalent weight of the metal is                   [CPMT 1986]
  A)
                  19.5        done clear
  B)
                  35.5 done clear
  C)
                  39.0        done clear
  D)
                  78.0 done clear
  View Solution play_arrow

• question_answer17)
  7.5 grams of a gas occupy 5.8 litres of volume at STP the gas is
  A)
                  \[NO\]     done clear
  B)
                  \[{{N}_{2}}O\] done clear
  C)
                  \[CO\]      done clear
  D)
                  \[C{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer18)
  The number of atoms in 4.25 g of \[N{{H}_{3}}\]is approximately [CBSE PMT 1999; MH CET 2003]
  A)
                  \[1\times {{10}^{23}}\]     done clear
  B)
                  \[2\times {{10}^{23}}\] done clear
  C)
                  \[4\times {{10}^{23}}\]     done clear
  D)
                  \[6\times {{10}^{23}}\] done clear
  View Solution play_arrow

• question_answer19)
  One litre of a gas at STP weight 1.16 g it can possible be [AMU 1992]
  A)
                  \[{{C}_{2}}{{H}_{2}}\]     done clear
  B)
                  \[CO\] done clear
  C)
                  \[{{O}_{2}}\]        done clear
  D)
                  \[C{{H}_{4}}\] done clear
  View Solution play_arrow

• question_answer20)
  The vapour density of a gas is 11.2. The volume occupied by 11.2 g of the gas at ATP will be [Bihar CET 1995]
  A)
                  11.2 L     done clear
  B)
                  22.4 L done clear
  C)
                  1 L          done clear
  D)
                  44.8 L done clear
  View Solution play_arrow

• question_answer21)
  Equivalent weight of crystalline oxalic acid is [MP PMT 1995]
  A)
                  30           done clear
  B)
                  63 done clear
  C)
                  53           done clear
  D)
                  45 done clear
  View Solution play_arrow

• question_answer22)
  The equivalent weight of an element is 4. Its chloride has a V.D 59.25. Then the valency of the element is             [BHU 1997]
  A)
                  4              done clear
  B)
                  3 done clear
  C)
                  2              done clear
  D)
                  1 done clear
  View Solution play_arrow

• question_answer23)
  1.25 g of a solid dibasic acid is completely neutralised by 25 ml of 0.25 molar \[Ba{{(OH)}_{2}}\]solution. Molecular mass of the acid is
  A)
                  100         done clear
  B)
                  150 done clear
  C)
                  120         done clear
  D)
                  200 done clear
  View Solution play_arrow

• question_answer24)
  The oxide of a metal has 32% oxygen. Its equivalent weight would be                                         [MP PMT 1985]
  A)
                  34           done clear
  B)
                  32 done clear
  C)
                  17           done clear
  D)
                  8 done clear
  View Solution play_arrow

• question_answer25)
  The mass of a molecule of water is                     [Bihar CEE 1995]
  A)
                  \[3\times {{10}^{-26}}\]kg               done clear
  B)
                  \[3\times {{10}^{-25}}\]kg done clear
  C)
                  \[1.5\times {{10}^{-26}}\]kg done clear
  D)
                  \[2.5\times {{10}^{-26}}\]kg done clear
  View Solution play_arrow

• question_answer26)
  1.24 gm P is present in 2.2 gm
  A)
                  \[{{P}_{4}}{{S}_{3}}\]      done clear
  B)
                  \[{{P}_{2}}{{S}_{2}}\] done clear
  C)
                  \[P{{S}_{2}}\]      done clear
  D)
                  \[{{P}_{2}}{{S}_{4}}\] done clear
  View Solution play_arrow

• question_answer27)
  The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A  contains y atoms, how many atoms are present in 2x g of B  
  A)
                  \[\frac{y}{2}\]        done clear
  B)
                  \[\frac{y}{4}\] done clear
  C)
                  y              done clear
  D)
                  2y done clear
  View Solution play_arrow

• question_answer28)
  Assuming fully decomposed, the volume of \[C{{O}_{2}}\]released at STP on heating 9.85g of \[BaC{{O}_{3}}\](Atomic mass of Ba=137) will be            [CBSE PMT 2000]
  A)
                  0.84 L     done clear
  B)
                  2.24 L done clear
  C)
                  4.06 L     done clear
  D)
                  1.12 L done clear
  View Solution play_arrow

• question_answer29)
  If \[{{N}_{A}}\]is Avogadro?s number then number of valence electrons in 4.2 g of nitride ions \[({{N}^{3-}})\]
  A)
                  2.4 \[{{N}_{A}}\] done clear
  B)
                  4.2 \[{{N}_{A}}\] done clear
  C)
                  \[1.6\,{{N}_{A}}\]                done clear
  D)
                  \[3.2\,{{N}_{A}}\] done clear
  View Solution play_arrow

• question_answer30)
  The weight of \[1\times {{10}^{22}}\]molecules of \[CuS{{O}_{4}}.5{{H}_{2}}O\]is [IIT 1991]
  A)
                  41.59 g   done clear
  B)
                  415.9 g done clear
  C)
                  4.159 g   done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer31)
  Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer from A, B, C and D (Atomic mass: N=14, O=16, Cu=63). 1 molecule of oxygen 1 atom of nitrogen \[1\times {{10}^{-10}}\]g molecular weight of oxygen \[1\times {{10}^{-10}}\]g atomic weight of copper
  A)
                  II<I<III<IV            done clear
  B)
                  IV<III<II<I done clear
  C)
                  II<III<I<IV            done clear
  D)
                  III<IV<I<II done clear
  View Solution play_arrow

• question_answer32)
  1.520 g of the hydroxide of a metal on ignition gave      0.995 gm of oxide. The equivalent weight of metal is [DPMT 1984]
  A)
                  1.520      done clear
  B)
                  0.995 done clear
  C)
                  19.00      done clear
  D)
                  9.00 done clear
  View Solution play_arrow

• question_answer33)
  How much coulomb charge is present on 1g ion of \[{{N}^{3-}}\]
  A)
                  \[5.2\times {{10}^{6}}\]Couloumb done clear
  B)
                  \[2.894\times {{10}^{5}}\]Couloumb done clear
  C)
                  \[6.6\times {{10}^{6}}\]Couloumb done clear
  D)
                  \[8.2\times {{10}^{6}}\]Couloumb done clear
  View Solution play_arrow

• question_answer34)
  Ratio of \[{{C}_{p}}\]and \[{{C}_{v}}\]of a gas X is 1.4, the number of atom of the gas ?X? present in 11.2 litres of it at NTP will be [CBSE 1999]
  A)
                  \[6.02\times {{10}^{23}}\]               done clear
  B)
                  \[1.2\times {{10}^{23}}\] done clear
  C)
                  \[3.01\times {{10}^{23}}\]               done clear
  D)
                  \[2.01\times {{10}^{23}}\] done clear
  View Solution play_arrow

• question_answer35)
  If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will                [AIEEE 2005]
  A)
                  Decrease twice done clear
  B)
                  Increase two fold done clear
  C)
                  Remain unchanged              done clear
  D)
                  Be a function of the molecular mass of the substance done clear
  View Solution play_arrow

• question_answer36)
  What should be the equivalent weight of phosphorous acid, if P=31; O=16; H=1
  A)
                  82           done clear
  B)
                  41 done clear
  C)
                  20.5        done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer37)
  The number of molecule at NTP in 1 ml of an ideal gas will be
  A)
                  \[6\times {{10}^{23}}\]     done clear
  B)
                  \[2.69\times {{10}^{19}}\] done clear
  C)
                  \[2.69\times {{10}^{23}}\]               done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer38)
  The specific heat of a metal is 0.16 its approximate atomic weight would be
  A)
                  32           done clear
  B)
                  16 done clear
  C)
                  40           done clear
  D)
                  64 done clear
  View Solution play_arrow

• question_answer39)
  The weight of a molecule of the compound \[{{C}_{60}}{{H}_{122}}\]is [AIIMS 2000]
  A)
                  \[1.4\times {{10}^{-21}}\]g              done clear
  B)
                  \[1.09\times {{10}^{-21}}\]g done clear
  C)
                  \[5.025\times {{10}^{23}}\]g           done clear
  D)
                  \[16.023\times {{10}^{23}}\]g done clear
  View Solution play_arrow

• question_answer40)
  What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene                         [CBSE PMT 1989]
  A)
                  2.8 kg     done clear
  B)
                  6.4 kg done clear
  C)
                  9.6 kg     done clear
  D)
                  96 kg done clear
  View Solution play_arrow

• question_answer41)
  What volume of \[N{{H}_{3}}\]gas at STP would be needed to prepare 100ml of 2.5 molal (2.5m) ammonium hydroxide solution
  A)
                  0.056 litres             done clear
  B)
                  0.56 litres done clear
  C)
                  5.6 litres done clear
  D)
                  11.2 litres done clear
  View Solution play_arrow

• question_answer42)
  If the density of water is 1 g \[c{{m}^{-3}}\]then the volume occupied by one molecule of water is approximately             [Pb. PMT 2004]
  A)
                  \[18\,\,c{{m}^{3}}\]           done clear
  B)
                  \[22400\,\,c{{m}^{3}}\] done clear
  C)
                  \[6.02\times {{10}^{-23}}\,\,c{{m}^{3}}\]  done clear
  D)
                  \[3.0\times {{10}^{-23}}\,\,c{{m}^{3}}\] done clear
  View Solution play_arrow

• question_answer43)
  Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is
  A)
                  4              done clear
  B)
                  6 done clear
  C)
                  2              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer44)
  A 400 mg iron capsule contains 100 mg of ferrous fumarate, \[{{(CHCOO)}_{2}}Fe\]. The percentage of iron pasent in it is approximately
  A)
                  33%        done clear
  B)
                  25% done clear
  C)
                  14%        done clear
  D)
                  8% done clear
  View Solution play_arrow

• question_answer45)
  The element whose a atom has mass of \[10.86\times {{10}^{-26}}\]kg is
  A)
                  Boron     done clear
  B)
                  Calcium done clear
  C)
                  Silver      done clear
  D)
                  Zinc done clear
  View Solution play_arrow

• question_answer46)
  The number of gram atoms of oxygen present in 0.3 gram mole of \[{{(COOH)}_{2}}.2{{H}_{2}}O\]is
  A)
                  0.6          done clear
  B)
                  1.8 done clear
  C)
                  1.2          done clear
  D)
                  3.6 done clear
  View Solution play_arrow

• question_answer47)
  A gaseous mixture contains \[C{{H}_{4}}\]and \[{{C}_{2}}{{H}_{6}}\]in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is
  A)
                  4.6 g       done clear
  B)
                  1.6 g done clear
  C)
                  2.3 g       done clear
  D)
                  23 g done clear
  View Solution play_arrow

• question_answer48)
  Vapour density of a metal chloride is 66. Its oxide contains 53% metal. The atomic weight of the metal is [Bihar MADT 1982]
  A)
                  21           done clear
  B)
                  54 done clear
  C)
                  27.06      done clear
  D)
                  2.086 done clear
  View Solution play_arrow

• question_answer49)
  One gram of hydrogen is found to combine with 80g of bromine one gram of calcium valency=2 combines with 4g of bromine the equivalent weight of calcium is
  A)
                  10           done clear
  B)
                  20 done clear
  C)
                  40           done clear
  D)
                  80 done clear
  View Solution play_arrow

• question_answer50)
  The equivalent weight of \[MnS{{O}_{4}}\]is half its molecular weight when it is converted to                                                [IIT 1988; CPMT 1994]
  A)
                  \[M{{n}_{2}}{{O}_{3}}\]  done clear
  B)
                  \[Mn{{O}_{2}}\] done clear
  C)
                  \[Mn{{O}_{4}}\]  done clear
  D)
                  \[MnO_{4}^{2-}\] done clear
  View Solution play_arrow

• question_answer51)
  \[100\ mL\] of \[P{{H}_{3}}\] on decomposition produced phosphorus and hydrogen. The change in volume is                [MNR 1986]
  A)
                  \[50\ mL\] increase                done clear
  B)
                  \[500\ mL\] decrease done clear
  C)
                  \[900\ mL\] decrease             done clear
  D)
                  Nil. done clear
  View Solution play_arrow

• question_answer52)
  \[12g\]of \[Mg\](at. mass 24) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be [CPMT 1978]
  A)
                  \[22.4\ L\]               done clear
  B)
                  \[11.2\ L\] done clear
  C)
                  \[44.8\ L\]               done clear
  D)
                  \[6.1\ L\] done clear
  View Solution play_arrow

• question_answer53)
  Which of the following has least mass                [Pb. PET  1985]
  A)
                  \[2\ g\] atom of nitrogen        done clear
  B)
                  \[3\times {{10}^{23}}\] atoms of \[C\] done clear
  C)
                  1 mole of \[S\]        done clear
  D)
                  \[7.0\ g\] of \[Ag\] done clear
  View Solution play_arrow

• question_answer54)
  How many mole of helium gas occupy \[22.4\ L\] at \[{{0}^{o}}C\] at 1 atm. pressure            [Kurukshetra CEE 1992; CET 1992]
  A)
                  0.11        done clear
  B)
                  0.90 done clear
  C)
                  1.0          done clear
  D)
                  1.11 done clear
  View Solution play_arrow

• question_answer55)
  Volume of a gas at STP is \[1.12\times {{10}^{-7}}\]cc. Calculate the number of molecules in it                                            [BHU  1997]
  A)
                  \[3.01\times {{10}^{20}}\]               done clear
  B)
                  \[3.01\times {{10}^{12}}\] done clear
  C)
                  \[3.01\times {{10}^{23}}\]               done clear
  D)
                  \[3.01\times {{10}^{24}}\] done clear
  View Solution play_arrow

• question_answer56)
  \[4.4\ g\] of an unknown gas occupies \[2.24L\] of volume at standard temperature and pressure. The gas may be [MP PMT 1995]
  A)
                  Carbon dioxide     done clear
  B)
                  Carbon monoxide done clear
  C)
                  Oxygen   done clear
  D)
                  Sulphur dioxide done clear
  View Solution play_arrow

• question_answer57)
  The number of moles of oxygen in \[1\ L\] of air containing 21% oxygen by volume, in standard conditions, is [CBSE PMT 1995; Pb. PMT 2004]
  A)
                  0.186 mol              done clear
  B)
                  0.21 mol done clear
  C)
                  2.10 mol                done clear
  D)
                  0.0093 mol done clear
  View Solution play_arrow

• question_answer58)
  The number of molecules in \[8.96\ L\] of a gas at \[{{0}^{o}}C\] and 1 atmosphere pressure is approximately                 [BHU 1993]
  A)
                  \[6.02\times {{10}^{23}}\]               done clear
  B)
                  \[12.04\times {{10}^{23}}\] done clear
  C)
                  \[18.06\times {{10}^{23}}\]             done clear
  D)
                  \[24.08\times {{10}^{22}}\] done clear
  View Solution play_arrow

• question_answer59)
  The equivalent weight of a metal is 9 and vapour density of its chloride is 59.25. The atomic weight of metal is [Pb. CET 2002]
  A)
                  23.9 done clear
  B)
                  27.3 done clear
  C)
                  36.3        done clear
  D)
                  48.3 done clear
  View Solution play_arrow

• question_answer60)
  The molecular weight of a gas is 45. Its density at STP is [Pb. PMT  2004]
  A)
                  22.4        done clear
  B)
                  11.2 done clear
  C)
                  5.7          done clear
  D)
                  2.0 done clear
  View Solution play_arrow

• question_answer61)
  Equivalent weight of a bivalent metal is 37.2. The molecular weight of its chloride is                  [MH CET 2003]
  A)
                  412.2      done clear
  B)
                  216 done clear
  C)
                  145.4      done clear
  D)
                  108.2 done clear
  View Solution play_arrow

• question_answer62)
  On reduction with hydrogen, 3.6 g of an oxide of metal left 3.2 g of metal. If the vapour density of metal is 32, the simplest formula of the oxide would be [DPMT 2004]
  A)
                  \[MO\]     done clear
  B)
                  \[{{M}_{2}}{{O}_{3}}\] done clear
  C)
                  \[{{M}_{2}}O\]     done clear
  D)
                  \[{{M}_{2}}{{O}_{5}}\] done clear
  View Solution play_arrow

• question_answer63)
  The number of molecules in 4.25 g of ammonia are [Pb. CET 2000]
  A)
                  \[0.5\times {{10}^{23}}\] done clear
  B)
                  \[1.5\times {{10}^{23}}\] done clear
  C)
                  \[3.5\times {{10}^{23}}\] done clear
  D)
                  \[1.8\times {{10}^{32}}\] done clear
  View Solution play_arrow