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a
Mg is used as a reducing agent in the extraction of boron and silicon
b
White pigment lithopone is (BaS + ZnSO4)
c
The order of hydration energy of the following is: Al3+>Be3+>Mg3+>Mg2+>Na⊕
d
Alkaline earth metals are weaker reducing agent than alkali metals.
answer is B.
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Detailed Solution
(1) Mg is more electropositive than B and Si(2) Lithopone is BaSO4+ZnS⋅BaSO4 is insoluble in H2O. (3) Hydration energy ∝ charge density Charge density = Ionic harge Ionic size (4) Oxidation potential of alkali metals is greater than that of alkaline earth metals. Hence 1st group undergo oxidation easily & thus are strong reducing agent and vice versa.