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NEET2012Chemistrys Block ElementsActual

Which is correct order of solubility in water?

Options

  1. ABa ( OH )₂ < Mg ( OH )₂
  2. BBaCO ₃> CaCO ₃
  3. CCaSO ₄ < MgSO ₄
  4. DCa ( OH )₂ Mg ( OH )₂

Correct answer

C. CaSO ₄ < MgSO ₄

Step-by-step solution

MgSO ₄ is readily soluble in water. The solubility of the sulphates of alkaline earth metals decrease with increase in size of the central metal ion. The greater hydration enthalpies of Mg ²⁺ ions overcome the lattice enthalpy factor and therefore MgSO ₄ is more soluble in water.

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