An amphoteric  oxide among the following is-

1. CO₂

2. CO

3. SnO₂

4. CaO

The products formed on heating Pb(NO₃)₂ are -

1. $\mathrm{PbO}, {\mathrm{N}}_2, {\mathrm{O}}_2$

2. Pb(NO₂ )_2, O₂

3. $\mathrm{PbO}, {\mathrm{NO}}_2, {\mathrm{O}}_2$

4. $\mathrm{Pb}, {\mathrm{N}}_2, {\mathrm{O}}_2$

The incorrect statement among the following is -

1. ${\mathrm{PbX}}_2$ is more stable than ${\mathrm{PbX}}_4$

2. ${\mathrm{PbCl}}_4$ is less stable than ${\mathrm{SnCl}}_4$ but ${\mathrm{PbCl}}_2$ is more stable than ${\mathrm{SnCl}}_2$

3. ${\mathrm{PbCl}}_4$ is less stable than ${\mathrm{SnCl}}_4$

4. Pb(II) is a good reducing agent while Sn(II) is not

Death due to gunshot is caused by poisoning of:

1.  Hg

2.  Pb

3.  Fe

4.  As

The most characteristic oxidation state for lead and tin is, respectively,:

1. +4, +2

2. +2, +4

3. +4, +4

4. +2, +2

A species among the following that decomposes easily is: -

When ${\mathrm{SnCl}}_2$ reacts with ${\mathrm{HgCl}}_2$, the product formed is-

1. $\mathrm{Sn}+{\mathrm{HgCl}}_4$

2. $\mathrm{Sn}+{\mathrm{Cl}}_2+{\mathrm{Hg}}_2{\mathrm{Cl}}_2$

3. ${\mathrm{SnCl}}_4 \mathrm{and} {\mathrm{Hg}}_2{\mathrm{Cl}}_2$

4. None of the above

Litharge is not commonly used in:

1. Manufacture of special glasses

2. Glazing pottery

3. Preparing paints

4. Lead storage battery

Sn crumbles to a powder in very cold weather, due to –

1. Expansion of the crystal lattice

2. Formation of SnO at low temperature

3. The conversion of Sn to powdery meta stannic acid

4. The transition from white tin to grey form, that is amorphous

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