Laws of Chemical Combination NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Laws of Chemical Combination MCQ Questions


1.
The Law of Conservation of Mass was proposed by:
A.
Antoine Lavoisier
B.
Joseph Gay-Lussac
C.
Joseph Proust
D.
John Dalton
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ANSWER :
A. Antoine Lavoisier
2.
The Law of Conservation of Mass states that:
A.
Mass increases during chemical reactions
B.
Mass is converted to energy in chemical reactions
C.
Mass can neither be created nor destroyed in physical and chemical changes
D.
Mass decreases during chemical reactions
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ANSWER :
C. Mass can neither be created nor destroyed in physical and chemical changes
3.
In which year did Lavoisier propose the Law of Conservation of Mass?
A.
1789
B.
1808
C.
1803
D.
1774
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ANSWER :
A. 1789
4.
If 12 g of carbon reacts completely with 32 g of oxygen, the mass of COâ‚‚ formed is:
A.
56 g
B.
20 g
C.
44 g
D.
32 g
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ANSWER :
C. 44 g
5.
In a chemical reaction, 7.0 g of nitrogen combines with 16.0 g of oxygen to form a compound. The total mass of the compound formed is:
A.
16.0 g
B.
7.0 g
C.
23.0 g
D.
9.0 g
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ANSWER :
C. 23.0 g
6.
In the reaction CaCO₃ → CaO + CO₂, if 100 g of CaCO₃ decomposes to produce 56 g of CaO, the mass of CO₂ produced is:
A.
32 g
B.
44 g
C.
56 g
D.
100 g
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ANSWER :
B. 44 g