The following compounds have been arranged in order of their increasing stabilities. Identify the correct order.
(I) `K_(2)CO_(3)` (II) `MgCO_(3)`
(III) `CaCO_(3)` (IV) `BeCO_(3)`

Options

A. `I lt II lt III lt IV`
B. `IV lt II lt III lt I`
C. `IV lt II lt I lt III`
D. `II lt IV lt III lt I`

Answer

B

Explanation

Down the group `(darr)`, stability of the carbonates increasing compatible of size of `M^(2+)` and `CO_(3)^(2-)`. Hence the order.