Question

Which of the following does not show diagonal relationship between beryllium and aluminium?

• A. Both $BeO$ and $A{l}_2{O}_3$ are amphoteric in nature.
• B. Both beryllium and aluminium form polymetric covalent hydrdes.
• C. Both beryllium and aluminium form nitrides with nitrogen which evolve $N{H}_3$ with water.
• D. Both metal carbonates are highly stable.

Answer 1

The correct option is D Both metal carbonates are highly stable.

$Be$ and $Al$ show diagonal relation but both of their carbonates are unstable because smaller and more charged metal cations tend to distort the electron cloud of $C{O}_3^{2+}$ ions (polarization).