Mole Concept and Stoichiometry

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Q.1. The temperature at which all molecular motion ceases is : *

1 point

Absolute zero

100°C

Zero power

0°C

Q.2. The volume occupied by 1 mole of gas at STP is : *

1 point

2·42 litres

22·4 litres

2·44 litres

2·24 litres

Q.3. The volume occupied by 7 g of nitrogen at STP is : *

1 point

5·6 litres

4·6 litres

4·8 litres

5·4 litres

Q.4. Which law states that “under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of molecule.” *

1 point

Law of conservation of mass

Avogadro’s law

Mole Law

Gay Lussac’s Law

Q.5. What is the value of Avogadro number ? *

1 point

6·022 × 10^23

6·22 × 10^–23

6·022 × 10^–23

6·22 × 10^23

Q.6. One atomic mass unit is how much part the mass of carbon-12 atoms ? *

1 point

1/4

1/8

1/12

1/16

Q.7. The number of atoms present in one molecule of an element is called its : *

1 point

Avogadro's number

Atomicity

Atomic number

Molecular number

Q.8. The vapour density of carbon dioxide [C = 12, O = 16] is : *

1 point

Q.9. The empirical formula of hexane is : *

1 point

C4H7

C5H8

C2H7

C3H7

Q.10. If empirical formula of an organic compound is CH2O then its molecular formula can be : *

1 point

C3H6O

C2H4O

C6H12O6

C2H2O2

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