p Block Elements (Group 13 & 14)

Assertion : $\mathrm{I}_2 \mathrm{O}_5$ is used to detect CO. Reason : In $\mathrm{I}_2 \mathrm{O}_5$, the oxidation number of I is +5 .

In processing of steel which of the following allotropes of carbon is used?

Assertion: Graphite is thermodynamically more stable than diamond. Reason : Free energy of formation of graphite is $1.9 \mathrm{~kJ}$ less than diamond.

Compound ' $X$ ' on reduction with $\mathrm{LiAlH}_4$ gives a hydride ' $Y$ ' containing $21.72 \%$ hydrogen along with other products. The compound ' $Y$ ' reacts with air explosively to give $\mathrm{B}_2 \mathrm{O}_3…

Assertion : $\mathrm{Pb}_3 \mathrm{O}_4$ reacts with $\mathrm{HNO}_3$ and forms $\mathrm{PbO}_2$. Reason : Lead is stable in +4 oxidation state.

Assertion : $\mathrm{Al}$ forms $\left[\mathrm{AlF}_6\right]^{3-}$ but $\mathrm{B}$ does not form $\left[\mathrm{BF}_6\right]^{3-}$. Reason : $\mathrm{B}$ does not react with $\mathrm{F}_2$.

Select the correct options from the following :

Among the following substituted silanes, the one which will give rise to cross-linked silicone polymer on hydrolysis is

Assertion : $\mathrm{H}_3 \mathrm{BO}_3$ is a weak acid. Reason: Water extracts the proton of $\mathrm{H}_3 \mathrm{BO}_3$.

Which of the following reactions does not take place? $\begin{aligned} & \mathrm{BF}_3+\mathrm{F}^{-} \longrightarrow \mathrm{BF}_4^{-} \\ & \mathrm{BF}_3+3 \mathrm{~F}^{-} \longrightarrow \mathrm{BF}_6^{3-} \\ &…

Addition of group-13 elements to intrinsic semiconductors results in

Which of the following is not $s p^2$ hybridised?