Question

15. Which of the following is used for dissolution of Gold? (a)HCl (b)Nitric Acid (c)Sulphuric Acid (d) Carbonic Acid​

Answer 1

Answer:

Aqua regia is used to dissolve gold.

Explanation:

Aqua regia is the mixture of concentrated nitric and hydrochloric acid in the ratio $1:3$

Gold is a noble metal it does not react with concentrated acids. The meaning of the term aqua regia is royal water. Its color is yellowish or red. $HNO_3$ is a strong oxidizing reagent it oxidizes $Au$ to $Au^{3+}$ and $HCl$ provides $Cl^{-}$ ions to  $Au^{3+}$  and result in the formation of $[AuCl_4]$  This is how aqua regia dissolves gold

Answer 2

Answer:

A is the answer because the dissolution of Gold is hydrochloride