Question

The oxide of \(14^{\text{th}}\) group element which only exists at high temperature is

• A. \(\mathrm{SnO}\)
• B. \(\mathrm{SiO}\)
• C. \(\mathrm{GeO_2}\)
• D. \(\mathrm{PbO_2}\)

Hint:

A unique fact for Group 14 elements: \[ \boxed{ \mathrm{SiO} \text{ exists only at high temperatures and disproportionates on cooling.} } \]

Answer 1

The Correct Option is B

Step 1: Recall the oxides of Group 14 elements. Among the oxides of Group 14 elements, \[ \boxed{\mathrm{SiO}} \] is stable only at very high temperatures. On cooling, it readily undergoes disproportionation: \[ \boxed{ 2\mathrm{SiO} \rightarrow \mathrm{Si}+\mathrm{SiO_2}. } \] Therefore, \[ \boxed{\mathrm{SiO}} \] exists only at high temperature. Hence, \[ \boxed{(B)} \] is the correct answer.