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 in the air
4. An interaction with of air at low temperature
Most ionic chloride is:
1.
2.
3.
4.
The amphoteric oxide among the following is -
1. | \(\mathrm{CO}_2 \) | 2. | \(\mathrm{PbO}_2 \) |
3. | \(\mathrm{SiO}_2 \) | 4. | \(\mathrm{SeO}_2\) |
Which is not used as pigment in paints?
(1) Lead dioxide
(2) White lead
(3) Lead chromate
(4)
Lead pipes are corroded by:
(1)
(2) HCl
(3)
(4) Pure water
Compound of lead used in match industry is:
(1) PbO
(2)
(3)
(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 reacts with conc. , the gas evolved in
(1)
(2)
(3)
(4)
The product formed on heating Pb(NO3)2
1.
2. Pb(NO2
3.
4.