Write expression for the equilibrium constant, `K_(c)`, for each of the following reactions:
(i) `2NOCl_((g))harr2NO_((g))+Cl_(2(g))`
(ii) `2Cu(NO_(3))_(2(s))hArr 2CuO_((s))+4NO_(2(g))+O_(2(g))`
(iii) `CH_(3)COOC_(2)H_(5(ag))+H_(2)O(I)hArr CH_(3)COOH_((aq))+C_(2)H_(5)OH_((aq))`
(iv) `Fe_((aq))^(+3)+3OH_((aq))^(-)hArrFe(OH)_(3(S)^(+))`

Explanation

Given eqation
`2NaCl_((g)) hArr 2NO_((g))+Cl_(2_(g))`
Equilibrium constant `K_(c)=([NO]^(2)[Cl_(2)])/([NoCl])`