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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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