The correct statement regarding polymeric silicon dioxide is -

1.  Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms

2.  Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms

3.  Silicon atom is bonded to two oxygen atoms

4.  These are double bonds between silicon and oxygen atoms

A compound among the following that is used in cosmetic surgery is -

1. Silica

2. Silicates

3. Silicones

4. Zeolites

When silicon is boiled with caustic soda solution, the gas is evolved is-

1. ${\mathrm{O}}_2$

2. ${\mathrm{SiH}}_4$

3. ${\mathrm{H}}_2$

4. None of the above

$$\begin{gathered} \mathrm{RCl} \underset{\mathrm{Si}}{\overset{\mathrm{cu}-\mathrm{powder}}{\to }}{\mathrm{R}}_2{\mathrm{SiCl}}_2\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to } \\ {\mathrm{R}}_2\mathrm{Si}{\left(\mathrm{OH}\right)}_2 \stackrel{\mathrm{condensation}}{\to } \mathrm{A} \end{gathered}$$

Compound (A) is -

1. A linear silicone

2. A chlorosilane

3. A linear silane

4. A network silane

A compound among the following that is not a monomer for a high molecular mass silicone polymer is-

1. ${\mathrm{Me}}_3\mathrm{SiCl}$

2. ${\mathrm{PhSiCl}}_3$

3. ${\mathrm{MeSiCl}}_3$

4. ${\mathrm{Me}}_2{\mathrm{SiCl}}_2$

Silicon carbide is used as:

1.  Dehydrating agent

2.  Abrasive

3.  Solvent

4.  Catalyst

${\mathrm{R}}_3\mathrm{SiCl}$ on complete hydrolysis forms-

1.  ${\mathrm{R}}_3\mathrm{SiOH}$

2.  ${\mathrm{R}}_3\mathrm{Si}—\mathrm{O}—{\mathrm{SiR}}_3$

3.  ${\mathrm{R}}_3\mathrm{Si}=\mathrm{O}$

4.  None of the above

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.

An anion present in the chain structure silicate is -

1. ${\mathrm{Si}}_2{\mathrm{O}}_7^{6-}$

2. ${\left({\mathrm{Si}}_2{\mathrm{O}}_5^{2-}\right)}_{\mathrm{n}}$

3. ${\left({\mathrm{SiO}}_3^{2-}\right)}_{\mathrm{n}}$

4. ${\mathrm{SiO}}_4^{4-}$

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.