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Question

In the reaction CaCO3(s)CaO(s)+CO2(g), at constant pressure, the work done by system on surrounding is?

A
Negative
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B
positive
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C
Zero
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D
None of these
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Solution

The correct option is A Negative
CaCO3(s)CaO(s)+CO2(g)
W=PextΔV
ΔV>0 because solid is going to gas
Hence, work done by the gas on the system is +ve
Hence, work done by the surrounding is <0
Hence, option A is correct.

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