Q. To dissolve argentite ore which of the following is used?
A) $Na\lbrack Ag(CN)_{2}\rbrack$
B) $NaCN$
C) $NaCl$
D) $HCl$
Explanation
(b)
Argentite is an ore of Ag having composition ${Ag}_{2}S$. It dissolves in NaCN due to formation of soluble complex.
${Ag}_{2}S\ + \ 4NaCN \longrightarrow \ 2Na\lbrack Ag(CN)_{2}\rbrack\ + \ NaCl$
$\therefore$ NaCN is used to dissolve argentite.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.