(a) Name the gas evolved when dilute hydrochloric acid is added to each of the following solids and the mixture is warmed

(i) sodium trioxocarbonate (IV);

(ii) potassium trioxosulphate (IV);

(iii) iron (II) sulphide.

(b) Name the reagent(s) that you would use to identify the gas in (a)(ii) above.

(a) The half-life of 56/25 Mn is 9.3 x 10\(^3\)S. What does the statement mean?

(b) Give the three types of radiation that are usually emitted by radioactive substances.

Consider the compounds represented as A and B below:

(a) What is the celationship between A and B? (

b) Name A and B.

(c) Will the chemical properties of A and B be the same? Give one reason for your answer.

(a) Name the components of

(i) producer gas; (ii) water gas;

(b) Give the reason why water is a better fuel than producer gas.

(a) State Le Chatelier's principle

(b) Use Le Chetelier's principle to deduce the conditions that favour a high yield of ammonia in the Haber process

(c) Give the chemical test for ammonia.

(d) State what would be observed when aqueous ammonia solution is added to:

(i) zinc chloride solution, (ii) copper (II) tetraoxosulohate (V) solution

(e) Explain why the H — N — H bond angle in ammonia is less than that of H — C — H in methane

(f) Give two uses of ammonia.