Which of the following have $\mathrm{X}-\mathrm{O}-\mathrm{X}$ linkage?

(where X is Central atom)

(i) $C{r}_2{O}_7^{2-}$                            (ii) ${\mathrm{S}}_2{\mathrm{O}}_3^{2-}$                       

(iii) Pyrosilicate                     (iv) Hyponitrous Acid

(1) (i) (iii)                                             

(2) (iii) (iv)

(3) (i) (iii) (iv)                                       

(4) (i) (ii)

Which bonds are formed by a carbon atom with $s{p}^2$ - hybridization?

1. $4\pi <mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>bonds$

2. $2\pi <mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>bonds<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>2\sigma <mspace\; width="1em"></mspace>bonds$

3. $1\pi -bonds<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>3\sigma -bonds$

4. $4\delta <mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>bonds$

What is the hybridization of the carbon atoms labeled $C_1$ and $C_2$ respectively in glycine?

   $C_1$             $C_2$

$\mathrm{1.\; s}{p}^2$          $s{p}^2$

2. $s{p}^2$          $s{p}^3$

$\mathrm{3.\; s}{p}^3$          $s{p}^2$

$\mathrm{4.\; s}p$            s$p^3$

Find the correct statement about the following molecule:

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.$\mathrm{<mspace\; width="1em"></mspace>}\mathrm{p\; orbitals}$

2. sp hybrid orbitals

3. $s{p}^2<mspace\; width="1em"></mspace>$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?

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) ${\mathrm{N}}_2\to {\mathrm{N}}_2^{+}$

Determine the bond with the highest average bond enthalpy.

1.  C=C 

2.  C=S

3.  C=O

4.  P=N