The density of a gas at \( 27^{\circ} \mathrm{C} \) and \( 1 \mathrm{~atm} \) is \( d \). Pressu...

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The density of a gas at \( 27^{\circ} \mathrm{C} \) and \( 1 \mathrm{~atm} \) is \( d \). Pressure remaining constant at which of the following temperatures will its density become \( 0.75 d \) ?
[AIPMT 1992]
(a) \( 20^{\circ} \mathrm{C} \)
(b) \( 30^{\circ} \mathrm{C} \)
(c) \( 400 \mathrm{~K} \)
(d) \( 300 \mathrm{~K} \)
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