Laws of Chemical Combination NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Laws of Chemical Combination MCQ Questions


13.
Pure water collected from different sources (rain, well, sea, distilled, etc.) always has 11.11% hydrogen and 88.89% oxygen by mass. This is in agreement with:
A.
Law of Definite Proportions
B.
Law of Conservation of Mass
C.
Avogadro's Law
D.
Law of Multiple Proportions
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ANSWER :
A. Law of Definite Proportions
14.
If 9 g of water always contains 1 g of hydrogen and 8 g of oxygen, this is in agreement with:
A.
Gay-Lussac's Law
B.
Law of Multiple Proportions
C.
Law of Conservation of Mass
D.
Law of Definite Proportions
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ANSWER :
D. Law of Definite Proportions
15.
Two different samples of common salt (NaCl) from different sources are analyzed. Both contain 39.34% sodium and 60.66% chlorine by mass. This is consistent with:
A.
Law of Definite Proportions
B.
Law of Conservation of Mass
C.
Law of Multiple Proportions
D.
Avogadro's Hypothesis
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ANSWER :
A. Law of Definite Proportions
16.
In a sample of COâ‚‚, the mass ratio of C:O is 3:8. In another sample of COâ‚‚ from a different source, this ratio:
A.
Will be 6:16
B.
Both B and C
C.
Will be 1:2
D.
Will be 3:8 (the same)
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ANSWER :
B. Both B and C
17.
The Law of Definite Proportions is NOT followed by:
A.
Compounds with fixed composition
B.
Non-stoichiometric compounds
C.
Pure substances
D.
Stoichiometric compounds
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ANSWER :
B. Non-stoichiometric compounds
18.
The Law of Multiple Proportions was proposed by:
A.
John Dalton
B.
Antoine Lavoisier
C.
Joseph Proust
D.
Amedeo Avogadro
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ANSWER :
A. John Dalton