Which of the following is not a perfect nonpolar molecule?

1. $B_3{N}_3{H}_6$                     

2. CCl₄

3. ${\mathrm{SO}}_3$                             

4. All of the above

Iodine molecules are held in the solid lattice by............

(1) London forces                     (2) dipole-dipole interactions

(3) Covalent bonds                   (4) coulombic force

Which substance has the highest melting point ? 

(a) CO

(b) $C{O}_2$

(d) $Si{O}_2$

(d) $P_2{O}_5$

The hybridisation of the  central  atom will change when: 

1. $N{H}_3$ combines with $H^{+}$

2. $H_{3}B{O}_{3_{}}$combines with $O{H}^{-}$

3. $N{H}_3$ forms $N{H_2}^{-}$

4. $H_{2}O$combines with $H^{+}$

Species having maximum $\text{'}CI—O\text{'}$ bond order is-

$1. {\mathrm{CIO}}_3^{-}$
$2. {\mathrm{CIO}}_{3 }$
$3. {\mathrm{CIO}}_{2 } { }_{ }$
$4. {\mathrm{CIO}}_2^{-}$

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