Select the correct statement:

(a)$HS{O}_5^{-}$ ion has one $\mathrm{S}—\mathrm{O}—\mathrm{H}$ linkage

(b) Number of $\mathrm{B}—\mathrm{O}—\mathrm{B}$ linkages in Borax is equal to number of $\mathrm{P}—\mathrm{O}—\mathrm{P}$ linkages in ${\mathrm{P}}_4{\mathrm{O}}_{10}$

(c) Hybridization of both sulphur on $\left({\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_5\right)$ (pyrosulphurous acid) is name but oxidization state of both sulphur are different

(d) Tetra -Polyphosphoric has four $\mathrm{P}—\mathrm{O}—\mathrm{P}$ and no $\mathrm{P}—\mathrm{P}$ linkage

The H-O-H bond angles in $H_3{O}^{+}$ are approximately ${107}^{°}$. The orbitals used by oxygen in these bond are best describe as: 

1. $\mathrm{p }orbitals$

2. sp hybrid orbitals

3. $s{p}^2$hybrid orbital

4. $s{p}^3$ hybrid orbital

Which of the following molecular species is not linear?

(1) $(\mathrm{CN}{)}_2$                                                       

(2) ${\mathrm{OCN}}^{-}$

(3) ${\mathrm{XeF}}_2$                                                         

(4) ${\mathrm{S}}_3^{2-}$

Which of the following statements is correct about the \(\mathrm{I_3^+}\)​ and \(\mathrm{I_3^-}\)​ molecular ions?

1. The number of lone pairs on the central atoms is the same in both ions.
2. The hybridization of the central atoms is the same in both ions.
3. Both are polar species.
4. Both are planar species.

The compound that has the highest ionic character associated with the X-Cl bond is:

1. ${\mathrm{PCl}}_5$ 

2. ${\mathrm{BCl}}_3$

3. ${\mathrm{CCl}}_4$

4. ${\mathrm{SiCl}}_4$

In which of the folllowing transformations, the bond order has increased and the magnetic behaviour has changed?

(a) ${\mathrm{C}}_2^{+}\to {\mathrm{C}}_2$                      (b) ${\mathrm{NO}}^{+}\to \mathrm{NO}$

(c) ${\mathrm{O}}_2\to {\mathrm{O}}_2^{+}$                       (d) ${\mathrm{N}}_2\to {\mathrm{N}}_2^{+}$

The bond having the highest bond energy is :

(1) C=C 

(2) C=S

(3) C=O

(4) P=N

H.O.M.O. (Highest Occupied Molecular Orbital) of CO molecular is :

(1) Non-bonding M.O. with slight antibonding character

(2) Non-bonding M.O. with slight bonding character

(3) Pure non-bonding M.O.

(4) None of the above

An incorrect match among the following is:

In which of the following species central atom is NOT surrounded by exactly 8 valence electrons?

(1) $B{F_4}^{-}$

(2) $NC{l}_3$

(3) $PC{l_4}^{+}$

(4) $S{F}_4$