Data for three salts are supplied: melting points NaCl=801°C, KCl=770°C, RbCl=718°C; molar enthalpy magnitudes of lattice formation are 788, 715, 689kJmol⁻¹ respectively. Which proposed orders are INC

Question

Data for three salts are supplied: melting points NaCl=801°C, KCl=770°C, RbCl=718°C; molar enthalpy magnitudes of lattice formation are 788, 715, 689kJmol⁻¹ respectively. Which proposed orders are INCORRECT?

TestHub · Accepted Answer

Both listed measured quantities decrease from NaCl to RbCl, rejecting B. Cation radius increases Na⁺→K⁺→Rb⁺, so polarizing power decreases, rejecting C. The same size argument gives covalent character RbCl<KCl<NaCl, making D correct; A matches the supplied temperatures.

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