Column-I		Column-II(units for Keq)
A)	${\mathrm{CaCO}}_3\left(s\right)\rightleftharpoons \mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)$	P)	Mol L-1
B)	${\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{NH}}_3\left(\mathrm{g}\right)+\mathrm{HCl}\left(\mathrm{g}\right)$	Q)	Unitless
C)	${\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{I}}_2\left(\mathrm{g}\right)\rightleftharpoons 2\mathrm{HI}\left(\mathrm{g}\right)$	R)	atm
D)	${{\mathrm{N}}_2}_{\left(\mathrm{g}\right)}+3{\mathrm{H}}_{2\left(g\right)}\rightleftharpoons 2{{\mathrm{NH}}_3}_{\left(\mathrm{g}\right)}$	S)	atm-2

	A	B	C	D
1.	Q	P	RS	RS
2.	P	Q	S	S
3.	PR	PR	Q	S
4.	RS	PS	P	Q