Question

Assertion (A): One mole of a gas occupies 24.4 litres at S.T.P.

Reason (R): The mass of one mole of a gas is equal to its molecular mass.

विकल्प

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is false but R is true.

Explanation:

At S.T.P., one mole of a gas occupies 22.4 litres, not 24.4 litres, so A is false. The mass of one mole of a gas, in grams, is numerically equal to its molecular mass, so R is true.