Silicon has a strong tendency to form polymers like silicones. The chain length of the silicone polymer can be controlled by adding

1.  ${\mathrm{MeSiCl}}_3$

2.  ${\mathrm{Me}}_2{\mathrm{SiCl}}_2$

3.  ${\mathrm{Me}}_3\mathrm{SiCl}$

4.  ${\mathrm{Me}}_4\mathrm{Si}$

Ionization enthalpy (${∆}_{\mathrm{i}}{\mathrm{H}}_1\mathrm{kJ} {\mathrm{mol}}^{-1}$) for the elements of Group 13 follows the order.

1.  B > Al > Ga > In > Tl

2.  B < Al < Ga < In < Tl

3.  B < Al > Ga < In > Tl

4.  B > Al < Ga > In < Tl

In the structure of diborane

1.  All hydrogen atoms lie in one plane and boron atoms lie in a plane perpendicular to this plane.

2.  2 boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular plane.

3.  4 bridging hydrogen atoms and boron atoms lie in one plane and two terminal hydrogen atoms lie in a plane perpendicular to this plane.

4.  All the atoms are in the same plane.

A compound X, of boron, reacts with ${\mathrm{NH}}_3$ on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating ${\mathrm{BF}}_3$ with Lithium aluminum hydride. The compounds X and Y are represented by the formulas.

1.  ${\mathrm{B}}_2{\mathrm{H}}_6, {\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

2.  ${\mathrm{B}}_2{\mathrm{O}}_3, {\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

3.  ${\mathrm{BF}}_3, {\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

4.  ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6, {\mathrm{B}}_2{\mathrm{H}}_6$

Quartz, widely employed as a piezoelectric material, contains the element:
1.  Pb
2.  Si
3.  Ti
4.  Sn

The most commonly used reducing agent is

1.  ${\mathrm{AlCl}}_3$

2.  ${\mathrm{PbCl}}_2$

3.  ${\mathrm{SnCl}}_4$

4.  ${\mathrm{SnCl}}_2$

Dry ice is

1.  Solid ${\mathrm{NH}}_3$

2.  Solid ${\mathrm{SO}}_2$

3.  Solid ${\mathrm{CO}}_2$

4.  Solid ${\mathrm{N}}_2$

In the following questions more than one correlation is possible between options of Column I and Column II. Make as many correlations as you can.

Match the species given in Column I with the hybridization given in Column II.

                Column I                                   Column II

(i) Boron in $[\mathrm{B}{\left(\mathrm{OH}\right)}_4{]}^{-}$                                 (a) ${\mathrm{sp}}^2$
(ii) Aluminium in ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$                       (b) ${\mathrm{sp}}^3$
(iii) Boron in ${\mathrm{B}}_2{\mathrm{H}}_6$                                        (c) ${\mathrm{sp}}^3{\mathrm{d}}^2$
(iv) Carbon in Buckminsterfullerene
(v) Silicon in ${\mathrm{SiO}}_4^{-}$
(vi) Germanium in ${\left[{\mathrm{GeCl}}_6\right]}^{2-}$

1. (i)→ (a), (ii) → (b), (iii) → (c), (iv) → (c) (v)→(b) (vi)→(a)

2. (i)→ (b), (ii) → (c), (iii) → (b), (iv) → (a) (v)→(b) (vi)→(c)

3. (i)→ (c), (ii) → (a), (iii) → (b), (iv) → (a) (v)→(c) (vi)→(b)

4. (i)→ (a), (ii) → (b), (iii) → (a), (iv) → (b) (v)→(c) (vi)→(a)

When we heat borax strongly, then it will yield the compound(s)

1. NaBO₂

2. B₂O₃

3. Na₂B₄O₇

4. Both 1 and 2

In borax, the hybridised state of boron is

1. sp²

2. sp³

3. sp² as well as sp³

4. sp