Question

A salt which reacts with dilute sulphuric acid, liberating a gas which turns lead acetate paper silver black. a] sodium sulphite b] sodium sulphide c] sodium sulphate

Answer 1

Answer:

sulphuric acid and sodium sulphite occurs in two steps and is a double replacement reaction. In the first step, sulphuric acid reacts with sodium sulphite to give sodium sulphate and sulphurous acid. In the second step, sulphurous acid, which is highly unstable decomposes spontaneously into sulphur dioxide and water.