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

done Laws of chemical combination Total Questions - 22

• question_answer1)
  Which of the following pairs of substances illustrate the law of multiple proportions                                   [CPMT 1972, 78]
  A)
                  CO and CO2          done clear
  B)
                  \[{{H}_{2}}O\text{ and }{{D}_{2}}O\] done clear
  C)
                  \[NaCl\text{ and }NaBr\]      done clear
  D)
                  \[MgO\text{ and }Mg{{(OH)}_{2}}\] done clear
  View Solution play_arrow

• question_answer2)
  1.0 g of an oxide of A contained 0.5 g of A. 4.0 g of another oxide of A contained 1.6 g of A. The data indicate the law of
  A)
                  Reciprocal proportions         done clear
  B)
                  Constant proportions done clear
  C)
                  Conservation of energy        done clear
  D)
                  Multiple proportions done clear
  View Solution play_arrow

• question_answer3)
  Among the following pairs of compounds, the one that illustrates the law of multiple proportions is
  A)
                  \[N{{H}_{3}}\text{ and }NC{{l}_{3}}\]          done clear
  B)
                  \[{{H}_{2}}S\text{ and }S{{O}_{2}}\] done clear
  C)
                  \[CuO\text{ and C}{{\text{u}}_{\text{2}}}O\] done clear
  D)
                  \[C{{S}_{2}}\text{ and }FeS{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer4)
  The percentage of copper and oxygen in samples of \[CuO\] obtained by different methods were found to be the same. This illustrates the law of                [AMU 1982, 92]
  A)
                  Constant proportions           done clear
  B)
                  Conservation of mass           done clear
  C)
                  Multiple proportions             done clear
  D)
                  Reciprocal proportions done clear
  View Solution play_arrow

• question_answer5)
  Two samples of lead oxide were separately reduced to metallic lead by heating in a current of hydrogen. The weight of lead from one oxide was half the weight of lead obtained from the other oxide. The data illustrates                                    [AMU 1983]
  A)
                  Law of reciprocal proportions             done clear
  B)
                  Law of constant proportions done clear
  C)
                  Law of multiple proportions                done clear
  D)
                  Law of equivalent proportions done clear
  View Solution play_arrow

• question_answer6)
  Chemical equation is balanced according to the law of [AMU 1984]
  A)
                  Multiple proportion              done clear
  B)
                  Reciprocal proportion          done clear
  C)
                  Conservation of mass           done clear
  D)
                  Definite proportions done clear
  View Solution play_arrow

• question_answer7)
  Avogadro number is
  A)
                  Number of atoms in one gram of element done clear
  B)
                  Number of millilitres which one mole of a gaseous substances occupies at NTP done clear
  C)
                  Number of molecules present in one gram molecular mass of a substance done clear
  D)
                  All  of these done clear
  View Solution play_arrow

• question_answer8)
  Different propartions of oxygen in the various oxides of nitrogen prove the                                                 [MP PMT 1985]
  A)
                  Equivalent proportion          done clear
  B)
                  Multiple proportion              done clear
  C)
                  Constant proportion             done clear
  D)
                  Conservation of matter done clear
  View Solution play_arrow

• question_answer9)
  Two elements X and Y have atomic weights of 14 and 16. They form a series of compounds A, B, C, D and E in which the same amount of element X, Y is present in the ratio 1 : 2 : 3 : 4 : 5. If the compound A has 28 parts by weight of X and 16 parts by weight of Y, then the compound of C will have 28 parts weight of X and             [NCERT 1971]
  A)
                  32 parts by weight of Y        done clear
  B)
                  48 parts by weight of Y        done clear
  C)
                  64 parts by weight of Y        done clear
  D)
                  80 parts by weight of Y done clear
  View Solution play_arrow

• question_answer10)
  Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively 12 : 16 and 12 : 32. These figures illustrate the
  A)
                  Law of multiple proportions                done clear
  B)
                  Law of reciprocal proportions             done clear
  C)
                  Law of conservation of mass               done clear
  D)
                  Law of constant proportions done clear
  View Solution play_arrow

• question_answer11)
  A sample of calcium carbonate \[(CaC{{O}_{3}})\] has the following percentage composition : Ca = 40%; C = 12%; O = 48%                 If the law of constant proportions is true, then the weight of calcium in 4 g of a sample of calcium carbonate obtained from another source will be
  A)
                  0.016 g   done clear
  B)
                  0.16 g done clear
  C)
                  1.6 g       done clear
  D)
                  16 g done clear
  View Solution play_arrow

• question_answer12)
  n g of substance X reacts with m g of substance Y to form p g of substance R and q g of substance S. This reaction can be represented as,  \[X+Y=R+S\]. The relation which can be established in the amounts of the reactants and the products will be
  A)
                  \[n-m=p-q\]           done clear
  B)
                  \[n+m=p+q\] done clear
  C)
                  \[n=m\]  done clear
  D)
                  \[p=q\] done clear
  View Solution play_arrow

• question_answer13)
  Which of the following is the best example of law of conservation of mass                                   [NCERT 1975]
  A)
                  12 g of carbon combines with 32 g of oxygen to form 44 g of \[C{{O}_{2}}\]            done clear
  B)
                  When 12 g of carbon is heated in a vacuum there is no change in mass done clear
  C)
                  A sample of air increases in volume when heated at constant pressure but its mass remains unaltered done clear
  D)
                  The weight of a piece of platinum is the same before and after heating in air done clear
  View Solution play_arrow

• question_answer14)
  The law of multiple proportions is illustrated by the two compounds                                            [NCERT 1972]
  A)
                  Sodium chloride and sodium bromide done clear
  B)
                  Ordinary water and heavy water done clear
  C)
                  Caustic soda and caustic potash done clear
  D)
                  Sulphur dioxide and sulphur trioxide done clear
  View Solution play_arrow

• question_answer15)
  In compound A, 1.00 g nitrogen unites with 0.57 g oxygen. In compound B, 2.00 g nitrogen combines with 2.24 g oxygen. In compound C, 3.00 g nitrogen combines with 5.11 g oxygen. These results obey the following law           [CPMT 1971]
  A)
                  Law of constant proportion done clear
  B)
                  Law of multiple proportion  done clear
  C)
                  Law of reciprocal proportion               done clear
  D)
                  Dalton's law of partial pressure done clear
  View Solution play_arrow

• question_answer16)
  Hydrogen combines with oxygen to form \[{{H}_{2}}O\] in which  16 g of oxygen combine with 2 g of hydrogen. Hydrogen also combines with carbon to form \[C{{H}_{4}}\] in which 2 g of hydrogen combine with 6 g of carbon. If carbon and oxygen combine together then they will do show in the ratio of
  A)
                  6 : 16 or 12 : 32    done clear
  B)
                  6 : 18 done clear
  C)
                  1 : 2        done clear
  D)
                  12 : 24 done clear
  View Solution play_arrow

• question_answer17)
  2 g of hydrogen combine with 16 g of oxygen to form water and with 6 g of carbon to form methane. In carbon dioxide 12 g of carbon are combined with 32 g of oxygen. These figures illustrate the law of
  A)
                  Multiple proportions             done clear
  B)
                  Constant proportions done clear
  C)
                  Reciprocal proportions         done clear
  D)
                  Conservation of mass done clear
  View Solution play_arrow

• question_answer18)
  An element forms two oxides containing respectively 53.33 and 36.36 percent of oxygen. These figures illustrate the law of
  A)
                  Conservation of mass           done clear
  B)
                  Constant proportions done clear
  C)
                  Reciprocal proportions         done clear
  D)
                  Multiple proportions done clear
  View Solution play_arrow

• question_answer19)
  After a chemical reaction, the total mass of reactants and products                                 [MP PMT 1989]
  A)
                  Is always increased               done clear
  B)
                  Is always decreased              done clear
  C)
                  Is not changed       done clear
  D)
                  Is always less or more done clear
  View Solution play_arrow

• question_answer20)
  A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.73% oxygen. The data support                 [AIIMS 1992]
  A)
                  Law of constant composition               done clear
  B)
                  Law of conservation of mass               done clear
  C)
                  Law of reciprocal proportions             done clear
  D)
                  Law of multiple proportions done clear
  View Solution play_arrow

• question_answer21)
  The law of definite proportions is not applicable to nitrogen oxide because                                 [EAMCET 1981]
  A)
                  Nitrogen atomic weight is not constant done clear
  B)
                  Nitrogen molecular weight is variable done clear
  C)
                  Nitrogen equivalent weight is variable done clear
  D)
                  Oxygen atomic weight is variable done clear
  View Solution play_arrow

• question_answer22)
  Which one of the following pairs of compounds illustrates the law of multiple proportion                                         [EAMCET 1989]
  A)
                  \[{{H}_{2}}O,\,N{{a}_{2}}O\]          done clear
  B)
                  MgO,\[N{{a}_{2}}O\] done clear
  C)
                  \[N{{a}_{2}}O,BaO\]          done clear
  D)
                  \[SnC{{l}_{2}},\,SnC{{l}_{4}}\] done clear
  View Solution play_arrow