p-Block Elements (Group 13 & 14)

Which of the following is electron-deficient ?

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

Which of the following structure is similar to graphite?

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

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

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

The basic structural unit of silicates is

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

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.

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

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

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

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

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