Question

To dissolve argentite ore which of the following is used
A .$Na[Ag{(CN)_2}]$
B. $NaCN$
C. $NaCl$
D. $HCl$

Answer 1

Hint: Argentite mineral has aesthetic value and is valuable. It is used as a silver ore. It has the potential to reduce the availability of metals and their toxicity in contaminated soils. Silver is mostly extracted from its ore by the process of smelting and chemical leaching.

Complete answer:
To dissolve argentite ore $NaCN$ is used. This process is called the Mac Arthur process. Argentite is the ore of silver and is represented with formula $A{g_2}S$.
Argentite reacts with $NaCN$ to form a soluble complex. Silver is then separated from the solution using zinc dust.
The reaction takes place as follows:
$A{g_2}S + 4NaCN \rightleftharpoons 2Na[Ag{(CN)_2}] + N{a_2}S$
$2Na[Ag{(CN)_2} + Zn \to N{a_2}[Zn{(CN)_4}] + 2Ag$
Mcarthur Forest Process is also known as the cyanide process. It is a leaching process used for the extraction of gold or silver. Leaching is used to concentrate silver and gold ores. The ore containing native metal is treated with the dilute solutions of $NaCN$ or $KCN$ in the presence of atmospheric oxygen.
Contacting the finely crushed ore with the cyanide solution, separating the solids from the clear solution, and precipitating the valuable metals from the solution using zinc dust are the three steps of the technique.

Note:
Hydrogen cyanide is converted to sodium cyanide by reacting it with sodium hydroxide. Because sodium cyanide is highly toxic, it is commonly used to kill or stun people quickly, such as in illicit cyanide fishing. Sodium cyanide, like other soluble cyanide salts, is among the fastest acting poisons ever discovered.