A 10.0 L flask contains 64 g of oxygen at 27°C. (Assume O_2 gas is behaving ideally). The pressure inside the flask in bar is(Given R = 0.0831 L bar K^-1 mol^-1)

1. 4.9

2. 2.5

3. 498.6

4. 49.8

Doubtly Asked 30 Oct 2026 NEET UG 2022 neet Save WhatsApp Report

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Answer: 1. 4.9

Key idea: use \(PV=nRT\).

\(n=64/32=2\) mol, \(T=300\) K.

\(P=\dfrac{nRT}{V}=\dfrac{2\times0.0831\times300}{10}=4.986\approx4.9\) bar (nearest option is 4.9; 4.986 bar is 4.9 when truncated to one decimal).

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

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