Question 70 of 72
Q.Maximum deviation from ideal gas is expected from :
(a) CH4(g)
(b) NH3(g)
(c) H2(g)
(d) N2(g)
Tamil Nadu DgeTamil Nadu HSC First Year (DGE) Board 2026MCQ· 1mImportance★★★★★est
97% · 70/72 Questions
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Start your 14-day free trial to unlock the full solution →The question asks which gas deviates most from ideal gas behaviour.
Ammonia (NH3) deviates most, because its polar, hydrogen-bonded molecules have the strongest intermolecular attractions of the four gases listed.
An ideal gas is assumed to have no intermolecular forces and negligible molecular volume. Real gases deviate from this ideal, and the deviation is greatest for gases whose molecules attract each other strongly (high polarity, hydrogen bonding, high critical temperature, easily liquefied).
Comparing the options:
- H2 (c) and N2 (d) are small, non-polar molecules with very weak dispersion forces — they behave nearly ideally.
- CH4 (a) is non-polar with only weak van der Waals forces. …
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