Topic: Matter and its nature, Dalton's atomic theory· Some Basic Concepts in Chemistry

A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is :

1. Z > 1 and attractive forces are dominant

2. Z > 1 and repulsive forces are dominant

3. Z < 1 and attractive forces are dominant

4. Z < 1 and repulsive forces are dominant

Doubtly Asked 30 Oct 2026 NEET UG 2019 neet Save WhatsApp Report

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Answer: 3. Z < 1 and attractive forces are dominant

Compressibility factor \(Z = V_{real}/V_{ideal}\).

The molar volume is 20% smaller, so \(V_{real} = 0.8V_{ideal}\) and \(Z = 0.8 < 1\).

\(Z<1\) means the gas is more compressible than ideal, which happens when attractive forces dominate. (\(Z>1\) indicates dominant repulsion.) Option (3).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is :

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