Carefully observe the given diagrams which indicate standard enthalpy of formation of different states of one mole of Mg and two moles of Cl atoms and match the entries in Column I and II provided.

Question

Carefully observe the given diagrams which indicate standard enthalpy of formation of different states of one mole of Mg and two moles of Cl atoms and match the entries in Column I and II provided.

Column I:
(A) ΔfH[Mg2+(aq)]
(B) ΔfH[Cl-(aq)]
(C) ΔHydrationH[Mg2+(g)]
(D) Lattice enthalpy of $MgCl_2$(s)

Column II:
(P) -1900 kJ/mol
(Q) +460 kJ/mol
(R) -625 kJ/mol
(S) +2510 kJ/mol

Prashant Kotian · Accepted Answer

Correct answer: A→Q; B→R; C→P; D→S. Evaluated using standard Born-Haber cycles:
- ΔhydrationH[Mg2+(g)] matches (P) (-1900 kJ/mol).
- Lattice enthalpy of matches (R).

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