The incorrect statement among the following is -

1. $\mathrm{Ge}{\left(\mathrm{OH}\right)}_2$ is amphoteric

2. ${\mathrm{GeCl}}_2$ is more stable than ${\mathrm{GeCl}}_4$

3. ${\mathrm{GeO}}_2$ is weakly acidic

4. GeCl₄ + 2HCl ⇄ H₂[GeCl₆]

Silicon carbide is used as:

${\mathrm{Mg}}_2{\mathrm{C}}_3$ has the following characteristics:

1.  It is called magnesium allylide

2.  It contains ${\mathrm{Mg}}^{2+}$ and ${\mathrm{C}}_3^{4-}$ions

3.  It on hydrolysis gives propyne

4.  All of the above

$\mathrm{CO}$ reacts with chlorine in presence of sunlight to give:

1.  ${\mathrm{COCl}}_2$

2.  ${\mathrm{CO}}_2$

3.  ${\mathrm{CCl}}_4$

4.  ${\mathrm{CHCl}}_3$

Chrome yellow is:

1.  ${\mathrm{PbCrO}}_4$

2.  ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$

3.  ${\mathrm{PbMoO}}_4$

4.  ${\mathrm{Pb}}_3{\mathrm{O}}_4$

Litharge is:

1. $\mathrm{PbO}$

2. ${\mathrm{PbO}}_2$

3. ${\mathrm{Pb}}_3{\mathrm{O}}_4$

4. $\mathrm{Pb}{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2$

Red lead is:

1.  $\mathrm{PbO}$

2.  ${{\mathrm{Pb}}_3\mathrm{O}}_4$

3.  ${\mathrm{PbO}}_2$

4.  $\mathrm{HgS}$

White lead or basic lead carbonate is:

1.  $\mathrm{Pb}{\left(\mathrm{OH}\right)}_2·2{\mathrm{PbCO}}_3$

2.  $\mathrm{Pb}{\left(\mathrm{OH}\right)}_2·\mathrm{Pb}{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2$

3.  ${\mathrm{PbCO}}_3$

4.  ${\mathrm{PbCO}}_3·\mathrm{Pb}{\left(\mathrm{OH}\right)}_2$

Hot and conc. ${\mathrm{HNO}}_3$ react with carbon to form:

1.  ${\mathrm{CO}}_2$

2.  $\mathrm{CO}$

3.  ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH}$

4.  ${\mathrm{NO}}_2+{\mathrm{CO}}_2$

${\mathrm{R}}_3\mathrm{SiCl}$ 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.