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Determine which of the following reactions at constant pressure represent surrounding that do work on the system environment :
(P) `4NH_(3)(g) + 7O_(2)(g) to 4 NO_(2)+ 6H_(2)O(g)`
(Q) `CO.O(g)+ 2H_(2)(g) to CH_(3)OH(l)`
(R) `C("s,graphite")+H_(2)O(g) to CO(g)+H_(2)(g)`
(S) `H_(2)O(s) to H_(2)O(l)`
A. III, IV
B. II and III
C. II, IV
D. I and II, IV

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Best answer
Correct Answer - D
`w=-P_("ext").DeltaV=-Deltan_(g)RT" and "Deltan_(g)" is -ve for I and III"`
also `" "DeltaV=-ve " for IV"`

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