Compound A is bubbled through bromine dissolved in carbon tetrachioride as follows :

(i) Draw the structure of A.

(ii) State your observation during this reaction.

Fill in the blanks using the appropriate words given in the bracket below:

[sulphur dioxide, nitrogen dioxide, nitric oxide, sulphuric acid]

(i) Cold, dilute nitric acid reacts with copper to give ……………

(ii) Hot, concentrated nitric acid reacts with sulphur to form ……………

State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following:

(i) copper sulphate solution

(ii) zinc sulphate solution.

Write equations for the reactions taking place at the two electrodes during the electrolysis of:

(i) Acidified CuSO₄ solution with copper electrodes.

(ii) Molten PbBr₂ with inert electrodes. (mention clearly the name of the electrode in each case)