Which statement is correct for the law of gaseous volumes?

Correct answer: Gas volumes are in simple ratio at same temperature and pressure

The direct answer is option A. The law of gaseous volumes says that reacting gas volumes and gaseous product volumes are related in simple whole-number ratios when all volumes are measured at the same temperature and pressure. The reasoning is: first identify that the statement is about gases and their volumes; next check the required conditions, namely equal temperature and pressure; then match it with Gay-Lussac's law. Option A includes both the correct quantity, gas volume, and the correct conditions, so it works. Option B says that lengths of solids are always equal. This is unrelated and is also not generally true. Option C refers to the taste of liquids, which has no connection with a chemical law of gas volumes. Option D says every mixture has a fixed colour; mixtures may have different colours and colour is not the measured quantity in this law. Therefore A is the only scientifically relevant statement. A useful exam reminder is that a volume-ratio law needs gases and specified common conditions; do not select an option merely because it mentions a physical property.