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28.0 g of nitrogen undergoes expansion from $1 atm, 10 {dm}^{3}$ to $0.5 atm, 20 {dm}^{3}$ against a constant external pressure in one step. The magnitude of work involved will be maximum when the external pressure is

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$0.5 atm$

$0.4 atm$

$0.3 atm$

$0.25 atm$

answer is A.

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Detailed Solution

For expression, $p_{ext} \leq p_{final} \cdot$ The magnitude of work will be maximum when $p_{ext} = p_{final}$

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