Some Important Compounds of Boron

Which of the following is formed when borax is heated strongly.

Write the chemical equation for the strong heating of borax.

Explain how boric acid is prepared and write its uses.

What are the uses of orthoboric acid?

Write the chemical equation for the preparation of orthoboric acid from borax.

An aqueous solution of borax is basic.

Which element of Group-$13$ is used as a control rod in nuclear reactor and also used in making bullet-proof vest?

$$A non-metallic element of Group-$13$, used in making bullet-proof vest is 

List the uses of boron and its compounds.

What is the formula of colemanite?

The tendency of $\mathrm{X}$ in ${\mathrm{BX}}_3 \left(\mathrm{X}=\mathrm{F}, \mathrm{Cl}, \mathrm{OMe}, {\mathrm{NMe}}_2\right)$ to form a $\pi$-bond with boron follows the order

An unknown inorganic compound $\text{'}\mathrm{A}\text{'}$ on reduction with ${\mathrm{LiAlH}}_4$ produced a hydride product $\text{'}\mathrm{B}\text{'}$ (along with other by-products). The product $\text{'}\mathrm{B}\text{'}$ contains $21.72\%$ of hydrogen in it. The product $\text{'}\mathrm{B}\text{'}$ on exposure to air gave boron trioxide. The compounds $\text{'}\mathrm{A}\text{'}$ and $\text{'}\mathrm{B}\text{'}$ are:

With reference to diborane $\left({\mathrm{B}}_2{\mathrm{H}}_6\right),$ identify the correct statement. 

Borax reacts with concentrated $\mathrm{HCl}$ to produce a boron containing compound $\mathrm{X}$. Heating $\mathrm{X}$ with ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ converts it into $\mathrm{Y}$, which gives green edged flame. Identify $\mathrm{X}$ and $\mathrm{Y}$.

A Lewis acid $\text{'}\mathrm{X}\text{'}$ reacts with ${\mathrm{LiAlH}}_4$ in ether medium to give a highly toxic gas. This gas when heated with ${\mathrm{NH}}_3$ gives a compound commonly known as inorganic benzene. The gas is

${\mathrm{B}}_2{\mathrm{H}}_6$ can't be prepared by :-

The bond dissociation energy of $\mathrm{B}-\mathrm{F}$ in ${\mathrm{BF}}_3$ is $646 \mathrm{kJ} {\mathrm{mol}}^{-1}$ whereas that of $\mathrm{C}-\mathrm{F}$ in ${\mathrm{CF}}_4$ is $515 \mathrm{kJ} {\mathrm{mol}}^{-1}$. The correct reason for higher $\mathrm{B}-\mathrm{F}$ bond dissociation energy as compared to that of $\mathrm{C}-\mathrm{F}$ is:-