A house wife gave some of her gold ornaments to a person for polishing . The person became happy, He conducted some chemical reactions and returned the polished ornaments. [Hint: - The person became happy because he got some gold in the 'dissolved form] a. Name the solvent used by the person to dissolve gold. b. Explain the chemistry of the reaction: c. How the person has recovered the dissolved goId from the solution?

Explanation

a. KCN
b. .4 ~A u+8 KCN+O_2+2 H_2 O rarr 4 ~K[Au(CN)_2]+4.
.K OH.
c. Gold is recoveréd from the solution.by adding riore reactive metal .Zn.. .2 ~K[Au(CN)_2]+Zn rarr K_2(Zn(CN)_4]+2 Au.