Silicones
Trending Questions
Q. Order of hydrolysis of the following in increasing order is as follows:
- I<II<III<IV
- I<IV<II<III
- IV<III<II<I
- I<II<IV<III
Q.
What are silicones? Write any five uses of silicones.
Q. Which of these is not a monomer for a high molecular mass silicone polymer?
- Me3SiCl
- PhSiCl3
- MeSiCl3
- Me2SiCl2
Q. The straight chain polymer is formed by:
- hydrolysis of CH3SiCl3 followed by condensation polymerization.
- hydrolysis of (CH3)4Si followed by addition polymerization.
- hydrolysis of (CH3)2SiCl2 followed by condensation polymerization.
- hydrolysis of (CH3)3SiCl followed by condensation polymerization.
Q. A type of zeolite used to convert alcohols directly into gasoline is:
- Zeolite L
- Zeolite Beta
- ZSM-5
- Zeolite A
Q.
The general formula of silicones is
Q. Hydrolysis of dimethyldichlorosilane followed by condensation polymerization gives:
- Monomers
- Dimers
- Polymers
- Trimers
Q.
Which metal is used in the making of microchips?
Q.
What are halides? What are some examples of them?
Q. Zeolites are used as catalyst in:
- Petrochemical industries during cracking
- the preparation of H2SO4
- the hydrolysis of ester
- all of the above
Q. What happens when silicon is heated with methyl chloride in presence of copper as a catalyst at 570 K?
- Methyl substituted dichlorosilanes are formed
- Only Me4Si is formed
- Polymerised chains of (CH3)3SiCl are formed
- Silicones are formed
Q. Hydrolysis of dimethyldichloro silane, (CH3)2SiCl2 followed by condensaiton polymerisation yields straight chain polymer of
Q. (CH3)3SiCl is used during polymerization of organosilicons because
- (CH3)3SiCl improves the quality and yield of the polymer
- (CH3)3SiCl does not block the end terminal of silicone polymer
- (CH3)3SiCl acts as a catalyst during polymerisation
- The chain length of organosilicon polymers can be controlled by adding (CH3)3SiCl
Q. (CH3)2SiCl2 on hydrolysis will produce
- (CH3)2Si(OH)2
- (CH3)2SiCl(OH)
- [−O−(CH3)2Si−O−]n
- (CH3)2Si=O
Q. Which of the following is the correct statement about silicones?
- They are made up of Si4−4 units
- They are water soluble compounds.
- They are hydrophilic in nature
- They are polymers made up of R2SiO units
Q. (Me)2SiCl2 on hydrolysis will produce -
- (Me)2Si(OH)2
- Me2SiCl(OH)
- (Me)2Si=O
- −[−O−(Me)2Si−O−]−n
Q. How many coulombs are required for the oxidation of 1 mole of H2O to O2 ?
Q.
what is the preparation of silicones?
Q. H2S2O7+H2O→?
- SO2+H2O
- SO3+H2S
- H2SO4
- None of these
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
- R3SiCl
- R4Si
- RSiCl3
- R2SiCl2
Q. Which silicon compound is used in machinery (with moving parts) in a manner similar to the use of an allotrope of carbon (crystalline) which possesses properties of both a covalent network solid and a molecular solid?
- Silica gel
- Zeolite
- Silicone
- Asbestos
Q. Silicones has the general formula:
- (SiO3)2−n
- SiO4−4
- Si2O6−7
- (R2SiO)n
Q. What is the *stability* order of ClO4- BrO4- IO4- ? Is it reverse of oxidising power
Q. Among the following polymers, which polymer is an addition polymer?
- Polypropylene
- Nylon 6, 10
- Dacron
- Bakelite
Q.
Why is asbestos used in fireproofing buildings?
Q. The straight chain polymer is formed by:
- hydrolysis of CH3SiCl3 followed by condensation polymerization.
- hydrolysis of (CH3)4Si followed by addition polymerization.
- hydrolysis of (CH3)2SiCl2 followed by condensation polymerization.
- hydrolysis of (CH3)3SiCl followed by condensation polymerization.
Q. Which of the following substance can be used as a raw material for obtaining alcohol?
- Potatoes
- Molasses
- Maize
- All of the above
Q. (CH3)2SiCl2 on hydrolysis will produce:
- (CH3)2Si(OH)2
- (CH3)2Si=O
- [−O−(CH3)2Si−O−]n
- (CH3)2SiCl(OH)
Q. Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding:
- MeSiCl3
- Me2SiCl2
- Me3SiCl
- Me4Si
Q.
Mention four uses of Fullerene.
