Column-I (Process)		Column-II ($∆\mathrm{G}$)
(I)	Melting of ice at 270.9 K	a)	Negative
(II)	Melting of ice at 273 K	b)	Zero
(III)	Melting of ice at 276.3 K	c)	Positive

Correct match is

	I	II	III
1)	a	b	c
2)	a	c	b
3)	c	a	b
4)	c	b	a

$\begin{array}{l}{\mathrm{H}}_2\mathrm{O}\left(\mathrm{s}\right)\rightleftharpoons {\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) ; \mathrm{\Delta H}=+\mathrm{ve} ; \mathrm{Melting} \mathrm{is} \mathrm{endothermic};\\ \mathrm{For}\mathrm{this}\mathrm{process}, \mathrm{\Delta S}=+\mathrm{ve} ; \mathrm{Melting} \mathrm{leads} \mathrm{to} \mathrm{increase} \mathrm{in} \mathrm{randomness} ;\\ \mathrm{\Delta G}=\mathrm{\Delta H}-\mathrm{T\Delta S}\\ \mathrm{\Delta G}=\left(+\mathrm{ve}\right)-\mathrm{T}\left(+\mathrm{ve}\right)\\ \mathrm{Melting}\mathrm{point}\mathrm{of}\text{\hspace{0.17em}\hspace{0.17em}ice\hspace{0.17em}\hspace{0.17em}}\mathrm{is}273\mathrm{K}\\ \therefore \mathrm{At}273\mathrm{K};\mathrm{\Delta G}=0\\ \mathrm{When}\mathrm{T}>273\mathrm{K}, \mathrm{\Delta G}=-\mathrm{ve}\\ \mathrm{When}\mathrm{T}<273\mathrm{K}, \mathrm{\Delta G}=+\mathrm{ve}\end{array}$