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JIPMER 2018
Exam
JIPMER
Year
2018
Subject
Chemistry
Chapter
s Block Elements

JIPMER 2018 · Chemistry · s Block Elements

If Na^ + ion is larger than Mg^ 2+ ions and S^ 2- ion is larger...

If Na+\mathrm{Na}^{+}ion is larger than Mg2+\mathrm{Mg}^{2+} ions and S2−\mathrm{S}^{2-} ion is larger than Cl−\mathrm{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 Na2 S,MgCl2\mathrm{Na}_2 \mathrm{~S}, \mathrm{MgCl}_2 and NaCl . Hence, MgS is stable salt in water and least soluble salt.
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