Among the sulphates of alkaline earth metals, the solubilities of \(\mathrm{BeSO}_{4}\) and \(\mathrm{MgSO}_{4}\) in water, respectively, are:

JEE Main · 2020 · 06 Sep 2020 · Shift 1 · s-Block Elements

Among the sulphates of alkaline earth metals, the solubilities of

BeSO_{4}

and

MgSO_{4}

in water, respectively, are:

(A)poor and poor
(B)high and poor
(C)high and high✓ Correct
(D)poor and high

Answer: (C)

Solution

The sulphates of the alkaline earth metals become steadily less soluble down the group, because the fall in hydration energy outweighs the fall in lattice energy. Beryllium and magnesium sit at the top of the group, so

BeSO X_{4}

and

MgSO X_{4}

are both highly soluble in water, the solubility dropping sharply only further down at calcium, strontium and barium. Both are therefore highly soluble.

JEE Main · 2020 · 06 Sep 2020 · Shift 1 · Single correct option

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JEE Main · 2020 · 06 Sep 2020 · Shift 1 · s-Block Elements

Solution

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