`{:(,"Column-I",,"Column-II"),((a),"Reversible adiabatic compression",(p),"Process in equilibrium"),((b),"Reversible vaporisation of liquid",(q),DeltaS_(system)lt0),((c),2N(g)rarrN_(2)(g),(r),DeltaS_("surrounding")lt0),((d),MgCO_(3)(s)oversetDeltararrMg(s)+CO_(2)(g),(s),DeltaS_("sublimation")=0):}`

Answer

A`to`s; B`to`p,r ; C`to` q ; D`to`p,r

Explanation

(A) For reversible process `DeltaS_("universe")=0`, and for adiabatic process `DeltaS_("system")=0`
(B) For reversible process `DeltaS_("universe")=0`, and in vaporisation entropy of system increases
( C)Number of gaseous moles decreases, So, entropy of system decreases and `N_2` is more stable.So, process is spontaneous For spontaneous process `DeltaS_("universe")gt0`
(D)Number of gaseous moles increases, So, entropy of system increases.