Class: XI Subject:
Chemistry
Total Marks: 15 Chapter:1
Choose correct options:
1. 9
grams of water decompose to give (1)
1g hydrogen and 8g oxygen
8g oxygen and 1g hydrogen
4g oxygen and 16g hydrogen
2g hydrogen and 1g oxygen
2. 100 g of CaCO3 on heating gave 44 g of CO2 and 56 g of CaO. The observation is in
agreement with the: (1)
Law of conservation of mass
Law of constant proportion
Law of multiple proportion
Law of reciprocal proportion
3. In carbon dioxide ratio of mass of
carbon to mass of oxygen is always 3:8 . This is in accordance with: (1)
Law of conservation of mass
Law of constant proportion
Law of multiple proportion
Law of reciprocal proportion,
4. The atomic masses and chemical
properties of Sulphur
Law of constant proportions
Law of conservation of mass
Laws of Chemical combination
5. Hydrogen and oxygen combine in the
ratio 1:8 by mass to form water. How much mass of oxygen gas would be required
to react completely with 3 g of hydrogen gas? (1)
8 g
16 g
24 g
32 g
6. Dalton
Law of conservation of mass
Law of definite proportions
Both law of conservation of mass and
law of definite proportions
Atomic numbers
7. Which postulate of Dalton
All matter is made of very tiny
particles called atoms
Atoms of a given element are identical
in mass and chemical properties.
Atoms combine in ratio of small whole
numbers to form compounds
The relative number and kinds of atoms
are constant in a given compound.
8. What is percentage composition of
oxygen in NO3- (1)
9. Calculate the molar mass of Ca (NO3)2. (1)
10. How many moles are in 26.9g of C11H12O11. (1)
11. Find the percentage composition of KMnO4. (2)
12. A compound has a percentage composition
of 46.681% Nitrogen and 53.32 % Oxygen. It’s molecular mass is 59.98 amu. What
is the empirical formula? What is it’s molecular formula? (3)
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