p-Block Elements (Group 13 & 14)

AlF3 is soluble in HF only in presence of KF. It is due to the formation of

1. K3[AlF3H3]
2. K3[AlF6]
3. AlH3
4. K[AlF3H]

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

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