Match Column I and II:

Column I:
(A) 2(g) → (g) + (g)
(B) 2(g) → 3(g)
(C) MgCO3(s) → (s) + (g)
(D) 2(g) → (g)

Column II:
(P) ΔH = +ve, ΔS = +ve
(Q) ΔH = -ve, ΔS = +ve

Question

Match Column I and II:

Column I:
(A) 2$HCl$(g) → $H_2$(g) + $Cl_2$(g)
(B) 2$O_3$(g) → 3$O_2$(g)
(C) MgCO3(s) → $MgO$(s) + $CO_2$(g)
(D) 2$NO_2$(g) → $N_2O_4$(g)

Column II:
(P) ΔH = +ve, ΔS = +ve
(Q) ΔH = -ve, ΔS = +ve
(R) ΔH = -ve, ΔS = -ve
(S) ΔH = +ve, ΔS = -ve

Prashant Kotian · Accepted Answer

Correct answer: A→S; B→Q; C→P; D→R. (A) Endothermic reaction with zero gas mole change (S).
(B) Highly exothermic decomposition of ozone with gas expansion (Q).
(C) Endothermic decomposition of carbonate forming gas (P).
(D) Exothermic dimerization of gas molecules reducing entropy (R).

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