Me₃SiCl is used during polymerization of organ silicones because

a.  Chain length of organic silicone polymers can be controlled by adding ${\mathrm{Me}}_3\mathrm{SiCl}$

b.  ${\mathrm{Me}}_3\mathrm{SiCl}$ blocks the end terminal of silicone polymer

c.  ${\mathrm{Me}}_3\mathrm{SiCl}$ improves the quality and yield of the polymer

4.  ${\mathrm{Me}}_3\mathrm{SiCl}$ acts as a catalyst during polymerization

Choose the correct option

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

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

Codes

          A          B          C           D       

1.      ii             iii         i             iii

2.     i            i           iii           ii

3.     iii            ii         ii            i

4.    i           iii            ii             iii

Assertion: If aluminium atoms replace a few silicon atoms in three-dimensional network of silicon dioxide, the overall structure acquires a negative charge.

Reason: Aluminium is trivalent while silicon is tetravalent.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.

2. Both assertion and reason are true and the reason is not the correct explanation of assertion.

3. Assertion is true but the reason is false.

4. Assertion is false but the reason is true.

Silicon has a strong tendency to form polymers like silicones. The chain length of 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.  ${\mathrm{Me}}_4\mathrm{Si}$

Quartz is extensively used as a piezoelectric material, it contains-

1.  Pb

2.  Si

3.  Ti

4.  Sn

Cement, the important building material is a mixture of oxides of several elements. Besides calcium, iron, and sulphur oxides of elements of which of the group(s) are present in the mixture?

1. Group 2

2. Groups 2, 13, and 14

3. Groups 2, and 13

4. Groups 2, and 14

Assertion: Silicones are water-repelling in nature.

Reason: Silicones are organosilicon polymers, which have $(-{\mathrm{R}}_2\mathrm{SiO}-)$ as repeating units.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true, but the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.