Chemistry Past Questions and Answers

Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of

Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by

Consider the following equation H<sub style='font-size: smaller;'>2</sub>O + 2Fe<sup style='font-size: smaller;'>2+</sup> + Cl<sub style='font-size: smaller;'>2</sub> ↔ 2Fe<sup style='font-size: smaller;'>3+</sup> + 2Cl<sup style='font-size: smaller;'>-</sup> + H<sub style='font-size: smaller;'>2</sub>O. The only ion which behaves as an oxidising agent is

If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is

Which of the following changes is physical?