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NEET2017Chemistrys Block ElementsActual

The correct order of solubility of the following compounds in water is

Options

  1. ABa ( OH )₂ < Mg ( OH )₂
  2. BBaCO ₃> CaCO ₃
  3. CCa ( OH )₂ Mg ( OH )₂
  4. DCaSO ₄ < MgSO ₄

Correct answer

D. CaSO ₄ < MgSO ₄

Step-by-step solution

MgSO ₄ is readily soluble in water. With increase in size of the central metal ion, the solubility of the sulphates of alkaline earth metals decreases as the hydration enthalpy from Be ²⁺ to Ba ²⁺ decreases down the group. Therefore, MgSO ₄ is more soluble in water than CaSO ₄ .

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