Q15 / 160 · AP EAMCET 2022 (04 Jul Shift 1) · Chemistry

Assertion (A):- MgSO4 is readily soluble in water

Reason (R):- The greater hydration enthalpy of Mg2+ ions overcome its lattice enthalpy.

  • Correct answer
    A
    A and R both are correct and R is the correct explanation of A.
  • B
    A and R both are correct but R is not the correct explanation of A.
  • C
    A is correct but R is not correct
  • D
    A is incorrect but R is correct

Solution

For a compound to be soluble in water, hydration enthapy must dominate over the lattice enthalpy. In MgSO4, Mg2+ being smaller in size, hydration enthalpy dominates over the lattice enthalpy of MgSO4. Hence, MgSO4 is readily soluble in water.

Hence, the correct answer is option: 'A'.

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