naing lu ma

Define the following terms. (8 marks)
(a) Electron affinity
(b) Gay-lussac’s law of oxidation number
(c) Molarity
(d) Electrolysis
(e) Reduction in terms of oxidation number
(f) A catalyst
(g) Chemical energetics
(h) An acid according to Lewis theory
SECTION (B)

1. Answer ALL questions. (12 marks)
   (a) What of chemical bond is formed between 3NH3 and H+ ion? Write down the electron dot-cross formula
   of the ion formed.
   (b) Define ‘ Relative density of a gas’. What is the relative density of nitrogen oxide? (O =16, N=14).
   (c) Write the balanced equation in words and symbols for the preparation of aluminium oxide (alumina).
   (d) Write down the reactions at the cathode and anode for the electrolysis of dilute sulphuric acid using
   platinum electrodes.