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NEET levelSingle correct optionDifficulty 1 of 3td058

For a process carried out at constant volume (only $P$ - $V$ work possible), the heat exchanged with the surroundings equals

A $Δ H$
B $P Δ V$
C $Δ U$
D $Δ G$

Answer: C

From the first law

Δ U = q + w

with

w = - P Δ V = 0

at constant volume, so

q_{V} = Δ U

. The heat at constant pressure, not constant volume, equals

Δ H

.

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