The gaseous product formed when ammonia is passed over heated copper (ll) oxide is

• A. oxygen
• B. nitrogen
• C. hydrogen
• D. nitrogen (l) oxide

(a) Give one example each of a naturally occurring substance that;

(i) conforms to the general formula C\(_x\)(H\(_2\)O)\(_y\);

(ii) contains the carboxyl group as its functional group.

(b) Name the process for obtaining: (i) paraffin oil from crude oil; (ii) benzene from ethyne.

Which of the following is not a halogen?

• A. Silicon
• B. Fluorine
• C. Astatine
• D. Bromine

(a) State two differences in the chemical properties of metals and non-metals.

(b) List two general methods of extract metals from their ores.

Which of the following is not a property of magnesium oxide?

• A. High melting point
• B. Dissolution in polar solvents
• C. Presence of ionic bonds
• D. Low binding energy

Which of the following is likely to have the highest degree of hardness?

• A. Carbonated water
• B. Distilled water
• C. Acidified water
• D. Rain water

The number of replaceable hydrogen atoms in one acid indicates its

• A. basicity
• B. acidity
• C. alkalinity
• D. reactivity

Destructive distillation of coal means

• A. heating coal in plentiful supply of air
• B. burning coal in air to produce water and carbon (IV) oxide
• C. heating coal in the absence of air
• D. heating coal in limited supply of air

The following compounds will decompose on heating except

• A. NaHCO₃
• B. K₂CO₃
• C. MgCO₃
• D. ZnCO₃

Potassium trioxochlorate (V) undergoes thermal decomposition according to the fotpowing equation: 2KCIO\(_3\) \(\to\) 2KCI + 3O\(_2\)

(a) What substance could be used in the laboratory to in ease the rate of the reaction

(ii) absorb the oxygen produced

(b) Give the reason why an aqueous solution of silver trioxonitrate (V) gives a white precipitate with KCI but not with KClO\(_3\).