In the reaction $C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$ , at constant pressure, the work done by system on surrounding is?

Negative

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positive

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Zero

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None of these

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Solution

The correct option is A Negative
$C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
$W = P_{e x t} Δ V$
$Δ V > 0$ because solid is going to gas
Hence, work done by the gas on the system is $+ v e$
Hence, work done by the surrounding is <0
Hence, option A is correct.

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