The compounds made up of only carbon and hydrogen are called?

• A. Carbon compounds
• B. Hydrocarbons
• C. Atoms
• D. Carbon hydrolysis

(a)(i) Explain the term pH

(ii) If sodium hydroxide solution were added to a solution of a strong acid, what would happen to the pH of the solution?

(b) Give one example of each of the following:

(i) acidic oxide

(ii) acid salt.

Separation of different carotenes from carrot root uses a method

• A) centrifugation
• B) Distillation
• C) chromatography
• D) carotinization

The mass number of an atom of an element is the sum of its

• A) Electrons, neutrons and protons
• B) Electrons and protons
• C) Protons and neutrons
• D) Valence electrons

An element X froms the following oxides X₂O, XO and XO₂. This phenomenon illustrates the law of?

• A. Conservation of mass
• B. Definite proportion
• C. Mass action
• D. Multiple proportion

Excess phosphorus was burnt in a gas jar and the residual gas passed successively over concentrated KOH solution and concentration H2SO4 before being collected in a flask. The gases collected are?

• A. carbon (IV) oxide, nitrogen and the rare gases
• B. nitrogen and the rare gases
• C. carbon (IV) oxide, nitrogen (IV) oxide and the rare gases
• D. carbon (IV) oxide

The by-product of fermentation of sugar is

• A. carbon(IV) oxide.
• B. ethanoic acid.
• C. propanol
• D. propan-1, 2, 3- triol.

The atom of an element X is represented as^y_zX. The basic chemical properties of X depend on the value of

• A. Y
• B. Z
• C. Y - Z
• D. Z - Y

An element used in the production of matches is

• A. nitrogen
• B. aluminium
• C. copper
• D. sulphur

(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?