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p-Block Elements (Group 13 & 14) · Question 20

NEET 2013MCQMedium📈 Topic in 38% papers+4−1
1

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

  1. Me3SiCl
  2. PhSiCl3
  3. MeSiCl3
  4. Me2SiCl2

Answer

(1) Me3SiCl

Solution

On hydrolysis, each Si–Cl bond becomes Si–OH, and the silanols condense to form Si–O–Si links.

Me2SiCl2 gives Me2Si(OH)2 (two –OH) ⇒ long chains.

MeSiCl3 and PhSiCl3 give three –OH groups ⇒ cross-linked polymers.

Me3SiCl gives Me3SiOH with only one –OH ⇒ it can only cap (block) the end of a chain.

As per NCERT, (CH3)3SiCl is used to block the ends of the chain, so it cannot build a high molecular mass polymer.

Answer: (1)

NEET 2013

Keep practising — p-Block Elements (Group 13 & 14)

2

The basic structural unit of silicates is

  1. SiO32-
  2. SiO42-
  3. SiO-
  4. SiO44-
NEET 2013
3

Which statement is wrong?

  1. Beryl is an example of cyclic silicate.
  2. Mg2SiO4 is orthosilicate.
  3. Basic structural unit in silicates is the SiO4 tetrahedron.
  4. Feldspars are not aluminosilicates.
NEET 2013 (Karnataka)
4

Name the type of the structure of silicate in which one oxygen atom of [SiO4]4- is shared.

  1. Linear chain silicate
  2. Sheet silicate
  3. Pyrosilicate
  4. Three dimensional
AIPMT 2011 (Prelims)
5

The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence

  1. BCl3 > BF3 > BBr3
  2. BBr3 > BCl3 > BF3
  3. BBr3 > BF3 > BCl3
  4. BF3 > BCl3 > BBr3
AIPMT 2010 (Prelims)
6

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

  1. Al < Ga < In < Tl
  2. Tl < In < Ga < Al
  3. In < Tl < Ga < Al
  4. Ga < In < Al < Tl
AIPMT 2009
7

The straight chain polymer is formed by

  1. hydrolysis of CH3SiCl3 followed by condensation polymerisation
  2. hydrolysis of (CH3)4Si by addition polymerisation
  3. hydrolysis of (CH3)2SiCl2 followed by condensation polymerisation
  4. hydrolysis of (CH3)3SiCl followed by condensation polymerisation
AIPMT 2009
8

Which of the following oxidation states are the most characteristic for lead and tin respectively?

  1. +2, +4
  2. +4, +4
  3. +2, +2
  4. +4, +2
AIPMT 2007
9

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

  1. (Si2O52-)n
  2. (SiO32-)n
  3. SiO44-
  4. Si2O76-
AIPMT 2007
10

Which one of the following statements about the zeolite is false?

  1. They are used as cation exchangers.
  2. They have open structure which enables them to take up small molecules.
  3. Zeolites are aluminosilicates having three dimensional network.
  4. Some of the SiO44- units are replaced by AlO45- and AlO69- ions in zeolites.
AIPMT 2004
11

Which one of the following compounds is not a protonic acid?

  1. B(OH)3
  2. PO(OH)3
  3. SO(OH)2
  4. SO2(OH)2
AIPMT 2003

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