The incorrect order of boiling point is-

1. ${\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{CH}}_3\mathrm{OH}$             

2. $\mathrm{N}{\left({\mathrm{CH}}_3\right)}_3<<mspace\; width="1em"></mspace>\mathrm{NH}{\left({\mathrm{CH}}_3\right)}_2$

3. ${\mathrm{H}}_3{\mathrm{PO}}_4><mspace\; width="1em"></mspace>{\mathrm{Me}}_3{\mathrm{PO}}_4$         

4. ${\mathrm{CH}}_3{\mathrm{N}}_3><mspace\; width="1em"></mspace>{\mathrm{HN}}_3$

When the substances Si, KCl, $C{H}_3$OH and $C_2{H}_6$ are arranged in order of increasing melting point , what is the correct order?

(1) Si, KCl ,$C{H}_3$OH ,$C_2{H}_6$

(2) $C{H}_{3}OH$, $C_2{H}_6$, Si ,KCl 

(3) KCl, Si, $C_2{H}_6$, $C{H}_{3}OH$

(4) $C_2{H}_6,<mspace\; width="1em"></mspace>C{H}_{3}OH<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>KCl<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>Si$

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?

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