Q. Which highly poisonous compound of potassium is used in the extraction of gold and silver?

A
Potassium hydroxide
B
Potassium cyanide
C
Potassium carbonate
D
Potassium superoxide
Solution:

Potassium cyanide is a compound with the formula KCN. This colorless crystalline salt, similar in appearance to sugar, is highly soluble in water. Most KCN is used in gold mining, organic synthesis, and electroplating. Smaller applications include jewelry for chemical gilding and buffing.

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