Symbols, Formulae and Simple Chemical Equations NDA Questions

NDA Chemistry

Symbols, Formulae and Simple Chemical Equations MCQ Questions


1.
The Law of Conservation of Mass, established by Antoine Lavoisier, states that:
A.
Mass can neither be created nor destroyed in a chemical reaction; total mass of reactants = total mass of products
B.
Mass of products is always greater than mass of reactants
C.
Total volume of reactants equals total volume of products
D.
Mass decreases during every chemical reaction
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ANSWER :
A. Mass can neither be created nor destroyed in a chemical reaction; total mass of reactants = total mass of products
2.
In an experiment, 2.8 g of iron reacts with sulphur to form 4.4 g of iron sulphide. Using the Law of Conservation of Mass, what mass of sulphur was used?
A.
4.4 g
B.
1.6 g
C.
6.0 g
D.
2.8 g
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ANSWER :
B. 1.6 g
3.
The Law of Constant Proportions (Definite Proportions), proposed by Joseph Proust, states:
A.
Elements always combine in a 1:1 ratio by mass
B.
A chemical compound always contains the same elements combined in the same fixed ratio by mass, regardless of its source or method of preparation
C.
The ratio of elements in a compound changes with temperature
D.
Different samples of the same compound can have different compositions
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ANSWER :
B. A chemical compound always contains the same elements combined in the same fixed ratio by mass, regardless of its source or method of preparation
4.
Which law of chemical combination was proposed by John Dalton and states that when two elements form more than one compound, the ratios of the different masses of one element combined with a fixed mass of the other element are small whole numbers?
A.
Law of Conservation of Mass
B.
Law of Definite Proportions
C.
Avogadro's Law
D.
Law of Multiple Proportions
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ANSWER :
D. Law of Multiple Proportions
5.
Avogadro's Law (1811) states that:
A.
Equal masses of all gases contain equal numbers of molecules
B.
All gases have the same molecular mass
C.
The volume of a gas is inversely proportional to its temperature
D.
Equal volumes of all gases under the same conditions of temperature and pressure contain equal numbers of molecules
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ANSWER :
D. Equal volumes of all gases under the same conditions of temperature and pressure contain equal numbers of molecules
6.
Which of the following scientists first proposed that matter is made up of tiny indivisible particles called 'atoms'?
A.
Joseph Proust
B.
John Dalton (1808), though the concept was proposed philosophically much earlier by Democritus (~400 BC)
C.
Amedeo Avogadro
D.
Antoine Lavoisier
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ANSWER :
B. John Dalton (1808), though the concept was proposed philosophically much earlier by Democritus (~400 BC)