Silicones

Q. Which of these is not a monomer for a high molecular mass silicone polymer ?

NEET 2013

1. $M{e}_{3}SiCl$
2. $PbSiC{l}_3$
3. $MeSiC{l}_3$
4. $M{e}_{2}SiC{l}_2$

Q.

Glass is soluble in

1. aqua-regia

2. HF

3. H2SO4

4. HClO4

Q.

$A+2H_{2}O\overrightarrow{-2HCl}HO-\stackrel{R}{\stackrel{|}{\underset{R}{\underset{|}{Si}}}}-OH$

$HO-\stackrel{R}{\stackrel{|}{\underset{R}{\underset{|}{Si}}}}-OH+HO-\stackrel{R}{\stackrel{|}{\underset{R}{\underset{|}{Si}}}}-OH\to B$

Identify A and B

1. 

2. 

3. 

4. 

Q.

The general formula of silicones is

1. 

2. 

3. 

4. 

Q. Mark the oxide which is amphoteric in character

1. CO₂

2. SiO₂

3. SnO₂

4. CaO

Q.

An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives a white precipitate (C) with NaOH solution which is soluble in excess of NaOH. (A) reduces auric chloride to produce purple of cassius. (A) also reduces iodine and gives chromyl chloride test. What are (A) to (C) and give the chemical reactions.

1. 

2. 

3. 

4. 

Q.

An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives a white precipitate (C) with NaOH solution which is soluble in excess of NaOH. (A) reduces auric chloride to produce purple of cassius. (A) also reduces iodine and gives chromyl chloride test. What is 'B' in the chemical reactions.

1. SnCl₂

2. Sn(OH)Cl

3. SnCl₄

4. Na₂SnO₂

Q.

Among the following substituted silanes, the one which will give rise to cross-linked silicone polymer on hydrolysis is:

1. 

2. 

3. 

4. 

Q.

$M{e}_{2}SiC{l}_2$ on hydrolysis will produce

1. $M{e}_{2}Si(OH{)}_2$

2. $M{e}_{2}SiO$

3. $[-O-M{e}_{2}Si-O-{]}_n$

4. $M{e}_{2}SiClOH$

Q. Among the following substituted silanes, the one which is used to terminate the process of silicone polymerization on hydrolysis to control its length is

1. $R_{3}SiCl$
2. $R_{4}Si$
3. $RSiC{l}_3$
4. $R_{2}SiC{l}_2$