A liquid is heated up to a certain temperature. Which one of the following situation would correspond to the boiling of the liquid?

When we heat lead nitrate [P(NO₃)₂] in a boiling tube, we observe the emission of brown fumes. Which one of the following is the brown gas?

Which one of the following statements regarding oxidation and reduction reactions is NOT correct ?

Copper sulphate crystals available in the market are blue coloured crystals. By careful heating, they turn to white colour. Which one of the following is responsible for the blue colour ?

Which one of the following is not an oxidation reaction?

Which one of the following statements regarding Bleaching powder and D.D.T. is correct ?