Which of the following statements accurately compare the thermal stability of compounds containing p — s Block Elements Chemistry Question

💡 Solution & Explanation

Thermal stability of large polyatomic anions (carbonates, sulphates) increases down the group as the size of the cation increases (decreasing polarizing power). $BeCO_3$ is so unstable it decomposes easily to $BeO$ and $CO_2$, so it is kept in a $CO_2$ atmosphere. Hydroxide stability and basicity *increase* down the group. Group 1 sulphates are highly stable to heat and generally do not decompose, they merely melt.