The soldiers of the Napolean army while at the Alps during freezing winter suffered a serious problem with regards to the tin buttons of their uniforms. White Metallic tin buttons get converted to grey powder. This transformation is related to-

1. An interaction with water vapour contained in humid air

2. A change in the crystalline structure of tin

3. A change in the partial pressure of $O_2$ in the air

4. An interaction with $N_2$ of air at low temperature

Most ionic chloride is:

1. $PbC{l}_2$

2. $CC{l}_4$

3. $PbC{l}_4$

4. $SiC{l}_4$

Find the amphoteric oxide among the following.

Which is not used as pigment in paints?

(1) Lead dioxide

(2) White lead

(3) Lead chromate

(4) $P{b}_3{O}_4$

Lead pipes are corroded by:

(1) $H_{2}S{O}_4$

(2) HCl

(3) $C{H}_{3}COOH$

(4) Pure water

Compound of lead used in match industry is:

(1) PbO

(2) $Pb{O}_2$

(3) $PbC{l}_2$

(4) None of these

Lead may be replaced from its salt solution by:

(1) Zn

(2) Au

(3) Ag

(4) Cu

Litharge is not commonly used in:

1. manufacture of special glasses

2. glazing pottery

3. preparing paints

4. lead storage battery

When $Pb{O}_2$ reacts with conc. $HN{O}_3$, the gas evolved in

(1) $N{O}_2$

(2) $O_2$

(3) $N_2$

(4) $N_{2}O$