p-Block Elements (Group 13 & 14)

Which one of the following elements is unable to form MF63- ion?

1. Ga
2. Al
3. B
4. In

It is because of inability of ns2 electrons of the valence shell to participate in bonding that

1. Sn2+ is oxidising while Pb4+ is reducing
2. Sn2+ and Pb2+ are both oxidising and reducing
3. Sn4+ is reducing while Pb4+ is oxidising
4. Sn2+ is reducing while Pb4+ is oxidising

Boric acid is an acid because its molecule

1. contains replaceable H+ ion
2. gives up a proton
3. accepts OH- from water releasing proton
4. combines with proton from water molecule.

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.