Consider the following statements

(i).	Carbon form the most acidic dioxide among the oxide of group 14.
(ii).	Pb mostly found in the +2 oxidation state.
(iii).	Only silicon used as a semiconductor.

Identify the correct statement(s):

1. Only iii

2. i, ii

3. ii, iii

4. Only ii

The incorrect statement among the following about silicone is-

${\mathrm{BF}}_3+\mathrm{LiH}\to \mathrm{X}+6\mathrm{LiF}$
$\mathrm{NaH} + {\mathrm{B}}_2{\mathrm{H}}_6\to \mathrm{Y}$

X and Y in the above reaction are-

$1. \mathrm{X}= {\mathrm{B}}_2{\mathrm{H}}_6 ; \mathrm{Y} = \mathrm{Na}\left[{\mathrm{BH}}_4\right]$
$2. \mathrm{X} ={\mathrm{BH}}_3 ; \mathrm{Y} ={\mathrm{Na}}_3\mathrm{B}$
$3. \mathrm{X}= {\mathrm{B}}_2{\mathrm{H}}_6 ; \mathrm{Y} = {\mathrm{Na}}_3\mathrm{B}$
$4. \mathrm{None} \mathrm{of} \mathrm{the} \mathrm{above}$

Consider the two ways of resonance in ${\mathrm{HCO}}_3^{-}$

The correct way(s) is/are-

1. Only a is correct

2. Only b is correct

3. Both a and b are correct

4. None of the above

Incorrect statement among the following options is :

The incorrect statement regarding diamond and graphite is-

The correct statement(s) regarding Lead compounds is/are:

1. Lead (II) reacts with Cl₂ to give PbCl₄

2. Lead (IV) chloride is highly stable towards heat.

3. Lead is not known to form an iodide, PbI₄

4. Both (1) and (3)

The complex formed on reaction of Sodium hexafluoroaluminate(III) with BF₃ is -

1. $\mathrm{Na}\left[{\mathrm{BF}}_4\right]$

2. ${\mathrm{Na}}_2\left[{\mathrm{BF}}_4\right]$

3. $\mathrm{Na}{\left[{\mathrm{BF}}_4\right]}_2$

4. None of the above 

Aluminum trifluoride is insoluble in anhydrous HF but dissolves on addition of NaF because:

The correct statement(s) among the following options is/are: