Uses of Boron and Aluminium and Their Compounds

Aluminium is used for making alloys because of its

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

List the uses of aluminium and its compounds.

Which of the following metals is used in aircraft construction?

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

List the uses of aluminium and its compounds.

List the uses of boron and its compounds.

Which one of the following statements is correct? (Please ignore the balancing wherever is applicable)

Aluminium is not used:

Alum is found to contain hydrated monovalent cation ${\left[\mathrm{M}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{+},$ trivalent cation ${\left[{\mathrm{M}}^{\text{'}}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$ and ${\mathrm{SO}}_4^{2-}$ in the ratio of:

For ${\text{NH}}_2\text{OH}·\text{HCl}+{\text{NaNO}}_2\to \text{X}\stackrel{\text{Cu}}{\to }\text{Y}+\text{A}\left(\text{g}\right)$ ; which of the following is correct ?

Identify the correct statements regarding the structure of $\mathrm{Al}{\left({\mathrm{BH}}_4\right)}_3$.

1. $\mathrm{Al}$ is sp³d² and B is sp³ hybridized.

2. It has $6 3\mathrm{c}-2\mathrm{e}$ bonds.

3. It has $6 \mathrm{Al}-\mathrm{H}-\mathrm{B}$ bonds.

4. It has $6 2\mathrm{c}-2\mathrm{e}$ bonds.