Question

An oxide $X$ in its normal form is almost non- reactive due to very high $X - O$ bond enthalpy. It resists the attack by halogens, hydrogen and most of acids and metals even at elevated temperatures. It is only attacked by $HF$ and $NaOH$. The oxide $X$ is

• A. $SiO_{2}$
• B. $CO_{2}$
• C. $SnO_{2}$
• D. $PbO_{2}$

Answer 1

Answer: (A)

$SiO_{2}$

Answer 2

$SiO_{2}$ is attacked by $HF$ and $NaOH$ but not by chemicals under normal conditions.