Chemistry Past Questions and Answers

The number of molecules in 1 dm³ of an ideal gas at STP is ____________<br/>i. 6.02 × 10²³<br/>ii. 2.69 × 10²²<br/>iii. Avogadro's number divided by 22.4<br/>iv. 6.02 × 10²³ / 22.4

The charge required to liberate 5.6 dm³ of O₂ at STP from water is ____________<br/>i. 1 Faraday<br/>ii. 2 Faradays<br/>iii. 4 Faradays<br/>iv. 3 Faradays

The main constituents of stainless steel are ____________<br/>i. Iron, chromium, and nickel<br/>ii. Iron, copper, and zinc<br/>iii. Iron and carbon only<br/>iv. Iron, chromium (at least 10.5%), and often nickel

The IUPAC name of the compound with a benzene ring attached to a carboxylic acid group is ____________<br/>i. Benzoic acid<br/>ii. Benzenecarboxylic acid<br/>iii. Phenyl methanoate<br/>iv. Benzaldehyde

The chief ore of aluminium is ____________<br/>i. Haematite<br/>ii. Bauxite<br/>iii. Magnetite<br/>iv. Al₂O₃·2H₂O with impurities