Question

Gold is extracted by hydrometallurgical process, based on its property:

• A. Of being electropositive
• B. Of being less reactive
• C. To form complexes which are water soluble
• D. To form salts which are water soluble

Answer 1

The correct option is C To form complexes which are water soluble

$4Au\left(s\right)+8C{N}^{-}+O_2\left(g\right)+2H_{2}O\to \underset{solublecomplex}{4\left[Au\right(CN{)}_2{]}^{-}}+4O{H}^{-}$