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Chemistry - 9 Chapter - 2
Chemical combination and Chemical Equations
Test - 8
1.
The ratio of substances in a compound will always be constant?
a) False
b) True
2.
Hydrogen and Oxygen combine in the ration of 2 : 16 (H
2
O) to give water. Can with the same ratio they give any other compound?
a) Can give H
6
O
6
.
b) Can give Hydrogen per Oxide.
c) Two answers are correct.
d) In this ratio they will give water only.
3.
Two elements may combine in more than one ratio to give different compounds?
a) True
b) False
4.
In law of multiple proportions we study how two similar elements can give different compounds by mixing in varying ratio.
a) True
b) False
5.
Which law proves that atoms do not break during a chemical change.
a) Law of definite proportion.
b) Law of conservation of mass.
c) Law of multiple proportions.
d) Law of reciprocal proportions.
6.
Carbon and Oxygen give two compounds i.e. carbon monoxide (CO) and carbon dioxide (CO
2
)
a) False
b) True
7.
In law of Multiple proportions which compounds are compared to prove that atoms do not break during chemical change.
a) 3. N
2
O and NH
3
b) 4. H
2
O and H
2
O
2
c) 2. CO and CO
2
d) 1. Answers 2 and 4 are correct.
8.
Oxygen and Hydrogen combine with nitrogen to give nitrogen oxide (N
2
O) and____?
a) Ammonia (NH
3
)
b) Carbon Dioxide (CO
2
).
c) Carbon Monoxide (CO).
d) Water (H
2
O)
9.
Which point of Dalton Theory does law of multiple proportions prove? Atoms do not break during a chemical change.
a) Atoms do not break during a chemical change.
b) The ratio between two elements in a chemical reaction always remains the same.
c) Conservation of mass.
10.
Hydrogen peroxide contains double the number of Oxygen atom than water?
a) True
b) False
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