(a) What is electrolysis?

(b) A current of 2A is passed through a copper voltameter for 5 minutes. If the electrochemical equivalent of copper is 3.27 x 10\(^{-7}\) kg. Determine the mass of the corper deposited.

The value of the e.m.f of a voltaic cell, which has dilute tetraoxosulphate (VI) acid as its electrolyte and copper and zinc as its electrodes becomes less with use. Explain this observation and state how it can be corrected.

(a) What is meant by 'a beam of polarised light?

(b) With the aid of well labelled diagrams, illustrate the action in of a polaroid spectacle on a beam of sunlight.

(a) Explain how a gas can be made to conduct electricity.

(b) Name the electric charge carriers in gases.

(a) State two properties of cathode rays.

(b) Explain how the intensity and energy of cathode rays may be increased.