Seema takes a blue crystalline salt P in a test tube. On heating it produces a white anhydrous powder. P is dissolved in water. Zinc is added to one part of the solution and to another part of the solution Barium chloride is added.

(a) Name the compound P.

(b) Mention one observation when zinc is added to the solution of P.

(c) State the colour of the precipitate formed when barium chloride is added to the solution of P.

Give reasons:

(a) Ethene undergoes addition reaction.

(b) Hydrocarbons can be used as fuels.

(c) Hydrogen chloride gas cannot be collected over water.

State one observation in the following cases:

(a) Sodium chloride solution is added to a solution of lead nitrate.

(b) Barium chloride solution is added to a solution of Zinc sulphate.

Copper sulphate solution is electrolysed using copper electrodes.

(a) Which electrode [cathode or anode] is the oxidizing electrode? Why?

(b) Write the equation for the reaction occurring at the above electrode.