Question

The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order.
$K_{2}C{O}_3$ (I) $MgC{O}_3$ (II) $CaC{O}_3$
(III) $BeC{O}_3$ (IV)

• A. I < II < III < IV
• B. IV < II < III < I
• C. IV < II < I < III
• D. II < IV < III < I

Answer 1

The correct option is B

IV < II < III < I

Thermal stability increases with increasing cationic size.