Question

Assertion (A): One gram molecule of any gas occupies 22.4 L volume at STP.

Reason (R): Under similar conditions of temperature and pressure equal masses of all gases occupy equal volumes.

• A. Both A and R are correct and R is the correct explanation for A
• B. Both A and R are correct but R is not the correct explanation for A
• C. A is correct, but R is wrong
• D. A is wrong, but R is correct

Answer 1

The correct option is C

A is correct, but R is wrong

Explanation for Assertion statement:

One gram molecule of any gas occupies 22.4 L volume at STP.

One gram molecule or 1 mole of a gas= 22.4 L of gas at STP (Standard temperature and pressure: T=273 K, P=1 atm)

Explanation for Reason statement:

According to Avogadro's law, under similar conditions of temperature and pressure, equal number of particles of all gases occupy equal volumes or equal volumes of all gases containing equal number of molecules.

Example: 22.4 L of a gas contain= 6.023×10²³ molecules of the gas at STP

Therefore, assertion is correct but the reason is wrong.

Hence option(c) is correct.