Level 1

The molecule having two unpaired electrons is:

Which of the following is having electrovalent, covalent and coordinate covalent bond?

Which of the following statements are true?

$\mathrm{I}.$ Water is liquid at room temperature due to hydrogen bonding.

$\mathrm{II}.$ Covalent bond is directional.

$\mathrm{III}.$ Co-ordinate or dative bond containing compounds have high values of dielectric constant.

The total number of electrons that take part in forming the bond in ${\mathrm{N}}_2$ is .......

The formal charge of the $\mathrm{O}$-atoms in the ion$\left[:\mathrm{N}=\mathrm{O}:\right]$ is

Compound ${\mathrm{SO}}_3$ has $\mathrm{x}$ bond pairs and $\mathrm{y}$ lone pairs. Calculate the value of $\mathrm{x}+\mathrm{y}.$

Find the number of molecules having two lone pairs on the central atom.

(i) ${\mathrm{I}}_3^{+}$ (ii) ${\mathrm{XeF}}_2$ (iii) ${\mathrm{XeF}}_4$ (iv) ${\mathrm{H}}_2\mathrm{O}$ (v) ${{\mathrm{NH}}_2}^{-}$ (vi) ${\mathrm{H}}_2\mathrm{S}$ (vii) ${\mathrm{H}}_2{\mathrm{SO}}_4$ (Viii) ${\mathrm{NF}}_3$

The total number of valance ${\mathrm{e}}^{-}$ in $2.6 \mathrm{g}$ of ${\mathrm{N}}_3^{-}$ ........