The correct order of increasing thermal stability of `K_(2)CO_(3),MgCO_(3),CaCO_(3),` and `BeCO_(3)` is

Options

A. `BeCO_3 lt MgCO_3 lt K_2CO_3 lt CaCO_3`
B. `BeCO_3 lt MgCO_3 lt CaCO_3 lt K_2CO_3`
C. `MgCO_3 lt BeCO_3 lt CaCO_3 lt K_2CO_3`
D. `K_2CO_3 lt MgCO_3 lt CaCO_3 lt BeCO_3`

Answer

B

Explanation

Thermal stability of carbonates increases in a group as we move from top to bottom and decreases in a period as we move from left to right. So the correct order of thermal stability of given carbonates is
`BeCO_3 lt MgCO_3 lt CaCO_3 lt K_2CO_3`
Be, Mg and Ca are present in second group and K is present in first group.