Question

What is the difference in HCN and KCN. And when are these used in what type of chemical reaction?
Its urgent

Answer 1

KCN Potassium Cyanide - very similar to hydrogen cyanide but thats the version used in cyanide pills.

Answer 2

heyyya frnd.
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HCN
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Hydrogen cyanide or hydroaconic acid is an inorganic compound. It is also called progic acid. It is a colorless volatile substance, which is highly toxic. In 1782 W. Shelley discovered it and received it from the Pioneer Neal.

KCN...

Potassium cyanide is a compound, which looks like colorless salt. To a large extent, it looks like sugar. It dissolves easily in water. Mostly it is used in gold mining and organic synthesis.

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@SRK6