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JIPMER2018Chemistrys Block Elements

If Na ⁺ ion is larger than Mg ²⁺ ions and S ²⁻ ion is larger than Cl ⁻ ion, which of the following will be stable salt in water?

Options

  1. ASodium chloride
  2. BSodium sulphide
  3. CMagnesium sulphide
  4. DMagnesium chloride

Correct answer

C. Magnesium sulphide

Step-by-step solution

Higher the lattice energy, lower the solubility and more stable the salt in water. Since, lattice energy varies directly with charge. Therefore, among the four combinations given, the lattice energy of MgS is higher than those of Na ₂ ~S , MgCl ₂ and NaCl . Hence, MgS is stable salt in water and least soluble salt.

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