Chemistry - 9 Chapter - 2Chemical combination and Chemical EquationsTest - 7

Chemistry - 9 Chapter - 2
Chemical combination and Chemical Equations
Test - 7

1. Which French scientist discarded worn out ideas and gave chemistry its right direction?

a) Jhon Daltun.
b) Robert Boyles.
c) Joseph Proust.
d) Antoine Lavoisier

2. Name first law of chemistry and who established it?

a) Law of Definite Proportions, Antoine avulsion
b) Law of conservation of mass, John Dalton.
c) No answer is correct.
d) Law of conservation of mass, Antoine Lavoisier.

3. Book of Lavoisier published in 1789 encouraged scientists to study the quantitative relationship between.........?

a) mixtures and compounds
b) formulas and equation
c) Molecule and Atom
d) reactants and products.

4. Lavoisier published his book in ________?

a) 1798
b) 1889
c) 1879
d) 1989

5. Who proved the law of definite proportions?

a) Joseph Proust
b) John Dalton
c) Robert Boyles
d) Lavoisier

6. The ratio between the masses of elements of a compound can be varied?

a) False
b) True

7. During a chemical reaction some of the mass is destroyed.

a) False
b) True

8. The ratio between masses of Hydrogen and Oxygen in water will always be_______.

a) 2:1
b) 8:1
c) 1:8
d) Two answers are correct

9. In sodium chloride (NaCl) The ratio of sodium and chlorine always remain 23 : 35.5 This proves?

a) Law of conservation of mass.
b) Law of reciprocal proportions
c) Law of multiple proportions.
d) Law of definite proportion

10. The ratio of substances in a mixture will always remain constant?

a) True
b) False

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