For a gas $(R / C_{v}) = 0.67$ , the gas is made up of molecules which are

monoatomic

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diatomic

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polyatomic

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mixture of gases

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Solution

The correct option is A monoatomic
$∵ R = C_{p} - C_{v}$
$∴ \frac{R}{C_{v}} = \frac{C_{p} - C_{v}}{C_{v}} = 0.67$
or $\frac{C_{p}}{C_{v}} - 1 = 0.670$ or $\frac{C_{p}}{C_{v}} = 1.67$

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