1. Tardigrade
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  3. Chemistry
  4. Assertion: Gold and silver are extracted from their native ores by leaching. Reason: Both silver and gold particles dissolve in dilute solution of sodium cyanide in presence of oxygen.

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Q. Assertion : Gold and silver are extracted from their native ores by leaching.
Reason : Both silver and gold particles dissolve in dilute solution of sodium cyanide in presence of oxygen.

General Principles and Processes of Isolation of Elements

Solution:

Leaching is often used if the ore is soluble in some suitable solvent. In the metallurgy of silver and gold, the respective metal is leached with a dilute solution of $NaCN$ or $KCN$ in the presence of air, which supplies $O _{2} .$ The metal is obtained later by replacement reaction.