It is especially dangerous to mix cyanide salts with acids because the cyanide ion reacts with acid to form hydrogen cyanide, a very weak acid that comes out of solution as a gas. Inhaled in even very small amounts it can rapidly cause death.

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This statement is true. Mixing cyanide salts with acids can generate hydrogen cyanide gas which is deadly if inhaled even in small amounts.

It Is Especially Dangerous to Mix Cyanide Salts with Acids