Silicon carbide is used as:

1.	Dehydrating agent	2.	Abrasive
3.	Solvent	4.	Catalyst

${\mathrm{R}}_3\mathrm{SiCl}$ on complete hydrolysis forms:

1.  ${\mathrm{R}}_3\mathrm{SiOH}$

2.  ${\mathrm{R}}_3\mathrm{Si}—\mathrm{O}—{\mathrm{SiR}}_3$

3.  ${\mathrm{R}}_3\mathrm{Si}=\mathrm{O}$

4.  None of the above.

The percentage of lead in a lead pencil is-

1.  20

2.  0

3.  80

4.  70

Tin cry refers to- 

1. Conversion of white to grey tin

2. Tin plating

3. Conversion of white tetrahedral tin to white rhombohedral tin

4. Emission of sound while bending a tin rod

The correct statement regarding polymeric silicon dioxide is -

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

The correct statement among the following is :

An element that cannot form ${\mathrm{MF}}_6^{3-}$ ion is-

The correct order of atomic radii of the group 13 elements is-

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

A compound among the following having a similar structure to graphite is:

1. B
2. B₄C
3. B₂H₆
4. BN