The correct order of increasing $C-OC-O$ bond length of $CO,C{O}_3^{2-},C{O}_{2}CO,\; CO\_3^\{2-\},CO\_2$ is

The geometry of $H_{2}SH\_2S$ and its dipole moment are

The hybridisation of atomic orbitals of nitrogen in $N{O}_2^{+},N{O}_3^{-},NO\_2^+,NO\_3^-,$ and $N{H}_4^{+}NH\_4^+$ are

The molecule which has zero dipole moment is

Which of the following is paramagnetic?

According to MO theory.

In the organic compound $C{H}_2=CH-C{H}_2-C{H}_{2}C\equiv CH,CH\_2\; =\; CH\; -\; CH\; \_2\; -\; CH\_2\; C\; \backslash equiv\; CH\; ,$ the pair of hydridised orbitals involved in the formation of $C_2-C_{3}C\_2\; -\; C\_3$ bond is

Which one of the following molecules is expected to exhibit diamagnetic behaviour?

In $P{O}_4^{3-}PO\_4^\{3-\}$ion, formal charge on the oxygen atom of P - O bond is 

Hydrogen bond is strongest in