One litre of a gas weighs \( 2 \mathrm{~g} \) at \( 300 \mathrm{~K} \) and \( 1 \mathrm{~atm} \)...

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One litre of a gas weighs \( 2 \mathrm{~g} \) at \( 300 \mathrm{~K} \) and \( 1 \mathrm{~atm} \) pressure. If the pressure is made \( 0.75 \mathrm{~atm} \), at which of the following temperatures will one litre of the same gas weigh one gram ?
[AIPMT 1992]
(a) \( 450 \mathrm{~K} \)
(b) \( 600 \mathrm{~K} \)
(c) \( 800 \mathrm{~K} \)
(d) \( 900 \mathrm{~K} \)
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