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 $\mathrm{\pi }-\mathrm{bond}\left(\mathrm{s}\right)<mspace\; width="1em"></mspace>\mathrm{in}<mspace\; width="1em"></mspace>{\mathrm{CH}}_2=\mathrm{C}=\mathrm{C}={\mathrm{CH}}_2<mspace\; width="1em"></mspace>\mathrm{are}<mspace\; width="1em"></mspace>\mathrm{located}<mspace\; width="1em"></mspace>\mathrm{in}:$

(1) all are in molecular plane

(2) two in a molecular plane and in a plane peerpendicular to moleclar plane which contains $\mathrm{C}-\mathrm{C}<mspace\; width="1em"></mspace>\mathrm{\sigma }-\mathrm{bond}$

(3) one in molecular plane and two in plane perpendicular to molecular plane which bisects $\mathrm{C}-\mathrm{C}<mspace\; width="1em"></mspace>\mathrm{\sigma }-\mathrm{bonds}$

(4) two in a molecular plane and one in a plane perpendicular to molecular plane which bisects $\mathrm{C}-\mathrm{C}<mspace\; width="1em"></mspace>\mathrm{\sigma }-\mathrm{bonds}$ 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. $H_{2}O<mspace\; width="1em"></mspace>$combines with $H^{+}$

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

$1.<mspace\; width="1em"></mspace>{\mathrm{CIO}}_3^{-}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>$
$2.<mspace\; width="1em"></mspace>{\mathrm{CIO}}_{3<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}$
$3.<mspace\; width="1em"></mspace>{\mathrm{CIO}}_{2<mspace\; width="1em"></mspace>}<mspace\; width="1em"></mspace>{<mspace\; width="1em"></mspace>}_{<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>$
$4.<mspace\; width="1em"></mspace>{\mathrm{CIO}}_2^{-}$

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

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

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

  $1.<mspace\; width="1em"></mspace>Xe{F}_{2<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>$
$2.<mspace\; width="1em"></mspace>S{F}_6$
$3.<mspace\; width="1em"></mspace>I{F}_{3<mspace\; width="1em"></mspace>}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>$
$4.<mspace\; width="1em"></mspace>All$

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. $\mu =0$