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p-Block Elements (Group 13 & 14) · Question 18

NEET 2013MCQEasy📈 Topic in 50% papers+4−1
1

Which of the following is electron-deficient ?

  1. (BH3)2
  2. PH3
  3. (CH3)2
  4. (SiH3)2

Answer

(1) (BH3)2

Solution

(BH3)2 is diborane, B2H6.

Valence electrons = 2 3 + 6 1 = 12, but 8 two-centre bonds would need 16 electrons.

As per NCERT, diborane has four terminal 2c–2e B–H bonds and two 3c–2e B–H–B (banana) bonds ⇒ it is electron-deficient.

PH3, (CH3)2 (ethane) and (SiH3)2 (disilane) have enough electrons for all normal covalent bonds.

Answer: (1)

NEET 2013

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

2

Which of the following structure is similar to graphite?

  1. B4C
  2. B2H6
  3. BN
  4. B
NEET 2013
3

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

  1. Me3SiCl
  2. PhSiCl3
  3. MeSiCl3
  4. Me2SiCl2
NEET 2013
4

The basic structural unit of silicates is

  1. SiO32-
  2. SiO42-
  3. SiO-
  4. SiO44-
NEET 2013
5

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)
6

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)
7

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)
8

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
9

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
10

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
11

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

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