JEE Main 2015 · 4 Apr · Shift 1 · Chemistry Q44

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ChemistrySingle correct+4 / -1Question 44 of 90

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy ?

\ce{CaSO4}

\ce{BeSO4}

\ce{BaSO4}

\ce{SrSO4}

Answer and worked solution

Official answer: B

$\ce{Be^2+}$ is very small, so its hydration enthalpy is very large and exceeds the lattice enthalpy of $\ce{BeSO4}$ , which is why $\ce{BeSO4}$ is water-soluble. Down the group the hydration enthalpy falls faster than the lattice enthalpy.

Topics:Important compounds of s-block

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JEE Main 2015 · 4 Apr · Shift 1, Chemistry question 44