Silicones

Q. Bromine is obtained on commercial scale from

1. Caliche

2. Common salt

3. Cryolite

4. Carnellite

Q. Name the type of hybridization of nitrogein N2H2 and N2H4

Q. Hydrolysis of dimethyldichloro silane, $(C{H}_3{)}_{2}SiC{l}_2$ followed by condensaiton polymerisation yields straight chain polymer of

1. 
2. 
3. 
4. 

Q.

Glass is soluble in

1. $HF$
2. $H_{2}S{O}_4$
3. $HCl{O}_4$
4. aqua-regia

Q.

Which of the following is basic structure of cyclic silicate?

1. 

2. 

3. 

4. 

Q. Under hydrolytic conditions, the compounds used for preparation of linear polymer and for chain termination, respectively, are

1. $C{H}_{3}SiC{l}_3$ and $Si(C{H}_3{)}_4$
2. $(C{H}_3{)}_{2}SiC{l}_2$ and $(C{H}_3{)}_{3}SiCl$
3. $(C{H}_3{)}_{2}SiC{l}_2$ and $C{H}_{3}SiC{l}_3$
4. $SiC{l}_4$ and $(C{H}_3{)}_{3}SiCl$

Q.

Name of the structure of silicates in which three oxygen atoms of $[Si{O}_4{]}^{4-}$ are shared -

1. Pyrosilicate

2. Sheet silicate

3. Linear chain silicate

4. Three dimensional silcate

Q. The correct order of negative elctron gain enthalpies of O, F, and Cl

Q. Which of the following is an organo silicon polymer ?

1. Silica
2. Silicone carbide
3. Silicic acid
4. Silicone

Q. Which one of the following anions is present in the chain structure silicates ?

1. $S{i}_2{O}_7^{6-}$
2. $(S{i}_2{O}_5^{2-}{)}_n$
3. $S{i}_2{O}_4^{4-}$
4. $(S{i}_2{O}_3^{2-}{)}_n$

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. $(R_{2}SiO{)}_x$

2. $(R_{2}S{i}_{2}O{)}_x$

3. $\left(R_{2}S{i}_{3}O\right)x$

4. $\text{None of these}$

Q. Under hydrolytic condition, the compounds used for preparation of linear polymer and for chain termination, respectively, are:

1. $SiC{l}_4$ and $(C{H}_3{)}_{3}SiCl$
2. $C{H}_{3}SiC{l}_3$ and $Si(C{H}_3{)}_4$
3. $(C{H}_3{)}_{2}SiC{l}_2$ and $C{H}_{3}SiC{l}_3$
4. $(C{H}_3{)}_{2}SiC{l}_2$ and $(C{H}_3{)}_{3}SiCl$

Q. Is there any formula to find number of resonating structures or any easy/fast method to find number of resonating structures? Regards

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. $A=(Sn{O}_{2}B=Sn(OH{)}_{2}C=SnC{l}_2$

2. $A=Sn(N{O}_3{)}_{2}B=SnC{l}_{2}C=Sn(OH{)}_2$

3. $A=SnC{l}_{2}B=Sn\left(OH\right)ClC=Sn(OH{)}_2$

4. $A=SnC{l}_{2}B=Sn{H}_{4}C=Sn(OH{)}_2$

Q. A type of zeolite used to convert alcohols directly into gasoline is:

1. Zeolite A
2. Zeolite L
3. Zeolite Beta
4. ZSM-5

Q. Mark the oxide which is amphoteric in character

1. $C{O}_2$

2. $Si{O}_2$

3. $Sn{O}_2$

4. CaO