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.

Question

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. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

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.

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.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

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 $N a CN$ or $K CN$ in the presence of air, which supplies $O_{2} .$ The metal is obtained later by replacement reaction.

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.