Blue vitriol contains which of the following types of bonds?

For the compound having the formula $GaAlCl_4$,the correct option from the following is:

What is an ionic bond? With two suitable examples,explain the difference between an ionic and a covalent bond.

Which one of the following is a Lewis acid?

$O-O$ bond length in $H_2O_2$ is $\underline{X}$ than the $O-O$ bond length in $F_2O_2$. The $O-H$ bond length in $H_2O_2$ is $Y$ than that of the $O-F$ bond in $F_2O_2$. Choose the correct option for $\underline{X}$ and $\underline{Y}$ from the given below.

If in $NH_3$ formation $N$ uses its pure atomic orbitals,then the wrong statement is: