1.

∆S is expected to be maximum for the reaction …………(a) Ca(s) + 1/2O2(g) → CaO(s) (b) C(s) + O2(g) → CO2(g) (c) N2(g) + O2(g) → 2NO(g) (d) CaCO3(g) → CaO(s) + CO2(g)

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(d) CaCO3(g) → CaO(s) + CO2(g)

In CaCO3(g) → CaO(s) + CO2(g) entropy change is positive. In (a) and (b) entropy change is negative; in (c) entropy change is zero.



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