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. $4\pi - bonds$

2. $2\pi - bonds and 2\sigma bonds$

3. $1\pi -bonds and 3\sigma -bonds$

4. $4\delta - bonds$

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$p^3$

Choose the correct option for the following molecule:

1. Non planar   

2. $\mu \ne 0$   

3. Both (1) and (2)     

4. $\mu =0$

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 statement is correct about ${I_3}^{+}$and ${I_3}^{-}$ molecure ions?

  (1) Number of lone pairs at central atoms are samein both molecure ions

  (2) Hybridization of central atoms in both ions are same

  (3) both are polar spacies

  (4) both are planar spacies

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