Identify the species having one $\pi$-bond and maximum number of canonical forms from the following :

Given below are two statements: Statement I: $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ and $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$ are $d^2 \mathrm{sp}^3$ hybridised. Statement Il: $\left[\mathrm{MnCl}_6\right]^{3-}$ and $\left[\mathrm{FeF}_6\right]^{3-}$ are paramagnetic and have 4...

The set in which compounds have different nature is :

Match List-I with List-II :
Choose the correct answer from the options given below :

In the following the correct bond order sequence is:

The hybridisations of the atomic orbitals of nitrogen in $\mathrm{NO}_2^{-}, \mathrm{NO}_2^{+}$andN $\mathrm{NH}_4^{+}$respectively are.

Which one of the following species doesn't have a magnetic moment of 1.73 BM, (spin only value) ?

The difference between bond orders of CO and $\mathrm{NO}^{\oplus}$ is $\frac{\mathrm{x}}{2}$ where $\mathrm{x}=$ $\_\_\_\_$ .
(Round off to the Nearest Integer)

In gaseous triethyl amine the "–C–N–C–" bond angle is ________ degree.

The oxidation states of ' $\mathrm{P}^{\prime}$ in $\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7, \mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_5$ and $\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_6$, respectively, are :