Two metals X and Y belong to the cond group of periodic table. X forms insoluble oxide but soluble sulphate. Y forms a soluble oxide but insoluble sulphate. Hydroxide of metal X is soluble in NaOH while that of metal Y is insoluble in NaOH. What are metals X and Y?

Options

A. `Ba` and `Mg`
B. `Na` and `K`
C. `Mg` and `Ba`
D. `K` and `Rb`

Answer

C

Explanation

`MgO` is insoluble, whereas `MgSO_(4)` is soluble, whereas `BaO` is soluble, but `BaSO_(4)` is insoluble.