Which of the following oxides is amphoteric in nature?

1. CO₂

2. CO

3. SnO₂

4. CaO

Which of the following statements regarding the relative stability of tin and lead compounds is incorrect?
 

1. PbX₂ is generally more stable than PbX₄.

2. PbCl₄ is less stable than SnCl₄, whereas PbCl₂ is more stable than SnCl₂.

3. PbCl₄ is less stable than SnCl₄.

4. Pb(II) is a good reducing agent, whereas 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

Which of the following lead compounds decomposes most readily?

The reagent that is used to remove ${\mathrm{SO}}_4^{2-}$ and Cl^- is -

1. NaOH             

2. Pb(NO₃)₂

3. BaSO₄             

4. KOH