(a)(i) Define in terms of electron transfer I. oxidizing agent; II. reducing agent.

(ii) Write a balanced equation to show that carbon in a reducing agent.

(iii) State the change in oxidation number of the specie that reacted with carbon in (a)((ii).

 

(b) A gas X has a vapour density of 32. It reacts with sodium hydroxide solution to form salt and water only. It decolourizes acidified potassium tetraoxomanganate (VII) solution and reacts with H\(_2\)S to form sulphur. Using the information provided:

(i) identify gas X; (ii) state two properties exhibited by X;

(iii) give two uses of X.

 

(c) Consider the following substances: sodium; lead (II) iodide; hydrogen; magnesium; oxygen. Which of the substances

(i) conducts electricity?

(ii) is produced at the cathode during electrolysis of H\(_2\)SO\(_{4(aq)}\)?

(iii) corresponds to the molecular formula A\(_2\)?

(iv) is an alkaline earth metal?

 

d)(i) Define the term salt.

(ii) Mention two types of salt

(iii) Give an example of each of the salts mentioned in (d)(ii) above.

 

(e) In a neutralization reaction, dilute tetraoxosulphate (VI) acid completely reacted with sodium hydroxide solution.

(i) Write a balanced equation for the reaction

(ii) How many moles of sodium hydroxide would be required for the complete neutralization of 0.50 moles of tetraoxosulphate (VI) acid?