Question

Give an example of a double displacement reaction that is accompanied by evolution of gas

Answer 1

Gas evolution reactions are a type of double displacement reaction where one of the products is a gas. ... For example, carbonic acid breaks down to water and carbon dioxide, sulfurous acid breaks down to water and sulfur dioxide, and ammonium hydroxide breaks down to water and ammonia gas.

Answer 2

Answer:BaCl(s) + H2SO4(aq) --> BaSO4(aq) + HCl(g)

Explanation: here precipitate formed is BaSO4 with evolution og HCl gas