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) $P_2{O}_5$

Nodal planes of $\mathrm{\pi }-\mathrm{bond}\left(\mathrm{s}\right) \mathrm{in} {\mathrm{CH}}_2=\mathrm{C}=\mathrm{C}={\mathrm{CH}}_2 \mathrm{are} \mathrm{located} \mathrm{in}:$

(1) all are in molecular plane

(2) two in a molecular plane and in a plane peerpendicular to moleclar plane which contains $\mathrm{C}-\mathrm{C} \mathrm{\sigma }-\mathrm{bond}$

(3) one in molecular plane and two in plane perpendicular to molecular plane which bisects $\mathrm{C}-\mathrm{C} \mathrm{\sigma }-\mathrm{bonds}$

(4) two in a molecular plane and one in a plane perpendicular to molecular plane which bisects $\mathrm{C}-\mathrm{C} \mathrm{\sigma }-\mathrm{bonds}$ at right angle.

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. $4\delta - bonds$

Which of the following species contains maximum number of atoms in 'XY' plane?

  $1. Xe{F}_{2 }$
$2. S{F}_6$
$3. I{F}_{3 }$
$4. All$

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. $\mu =0$