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Match the following :

(i) Entropy of vapourisation (a) decreases

(ii) K for spontaneous process (b) is always positive

(iii) Crystalline solid state (c) lowest entropy

(iv) $\Delta U$ in adiabatic expansion of ideal gas (d) $\frac{\Delta H_{vap}}{T_{b}}$

Answers (1)

(i) - b, d

(ii) - b

(iii) -c

(iv) -a

Explanation:

Col I	Col II
(i) Entropy of vaporisation	ΔH vap / T
(ii) K for spontaneous process	$Since\; \; \Delta ,G^{\ominus}=\Delta , H^{\ominus}-T\Delta ,S^{\ominus}=-RT$
(iii) Crystalline solid state	Molecules in the solid state of matter are the most stable and ordered and hence have the least entropy
(iv) ΔU in adiabatic expansion of ideal gas	ΔU decreases as in the situation of expansion, the system is the one that does work. so, q =0 and ΔU = -w

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