An amphoteric  oxide among the following is-

1. CO₂

2. CO

3. SnO₂

4. CaO

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

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

Lead pipes can be used for:

1.  soft water

2.  hard water

3.  both hard and soft water

4.  none of the above

Ordinary glass is:

1.  sodium silicate

2.  copper silicate

3.  calcium silicate

4.  a mixture of calcium and sodium silicates with silica

The substance used to impart green colour to glass is:

1.  ${\mathrm{Cu}}_2\mathrm{O}$

2.  $\mathrm{CdS}$

3.  ${\mathrm{MnO}}_2$

4.  ${\mathrm{Cr}}_2{\mathrm{O}}_3$

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

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

1. ${\mathrm{NO}}_2$

2. ${\mathrm{O}}_2$

3.  ${\mathrm{N}}_2$

4.  ${\mathrm{N}}_2\mathrm{O}$

Conc. $HN{O}_3$ can be stored in a container of:

(1) Cu

(2) Al

(3) Zn

(4) Sn