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

The incorrect statement among the following is:

1.  SnF₄ is ionic in nature.

2.  PbF₄ is covalent in nature.

3.  SiCl₄ is easily hydrolysed.

4.  GeX₄ (X = F, Cl, Br, I) is more stable than GeX₂

The correct statement among the following is :

${\mathrm{PbO}}_2$ on reaction with ${\mathrm{HNO}}_3$ gives gas:

1. ${\mathrm{NO}}_2$

2. ${\mathrm{O}}_2$

3.  ${\mathrm{N}}_2$

4.  ${\mathrm{N}}_2\mathrm{O}$

The thermal stability order for group 14 halides is:

1.  ${\mathrm{GeX}}_2 < {\mathrm{SiX}}_2 < {\mathrm{SnX}}_2 < {\mathrm{PbX}}_2$

2.  ${\mathrm{SiX}}_2 < {\mathrm{GeX}}_2 < {\mathrm{PbX}}_2 < {\mathrm{SnX}}_2$

3.  ${\mathrm{SiX}}_2 < {\mathrm{GeX}}_2 < {\mathrm{SnX}}_2 < {\mathrm{PbX}}_2$

4.  ${\mathrm{PbX}}_2 < {\mathrm{SnX}}_2 < {\mathrm{GeX}}_2 < {\mathrm{SiX}}_2$

The carbon of microphones used in public address systems is:

1.  graphite

2.  charcoal

3.  coke

4.  lamp black

Litharge is not commonly used in:

1.  manufacture of special glasses

2.  glazing pottery

3.  preparing paints

4.  lead storage battery

If a person is injured by the shot of a gun and all the pellets could not be removed, it may cause poisoning by:

1.  Hg

2.  Pb

3.  Fe

4.  As