Melting & boiling point of NaCl respectively are 1080 K & 1600K. `Delta S` for stage -I & II in `NaCl_((s)) underset(Delta H_("fus") = 30kJ)overset(I)rarr NaCl_((l)) underset(Delta H_("vap") = 160kJ)overset(II)rarr` are

Options

A. `{:(Delta S (I) (KJ//mol//K),Delta S (II) (KJ//mol//K)),(1//36,1//10):}`
B. `{:(Delta S (I) (KJ//mol//K),Delta S (II) (KJ//mol//K)),(36,100):}`
C. `{:(Delta S (I) (KJ//mol//K),Delta S (II) (KJ//mol//K)),(1//36,10):}`
D. `{:(Delta S (I) (KJ//mol//K),Delta S (II) (KJ//mol//K)),(36,1//10):}`

Answer

A

Explanation

Stage-I is fusion
`Delta S_("fusion") = (Delta H_("fusion"))/(M.P) = (30 xx 10^(3))/(1080) = (1)/(36)` KJ
State -II is vapouraization
`Delta S_("vap") = (Delta H_("vap"))/(B.P) = (160 xx 10^(3))/(1600) = (1)/(10)KJ`