Which of the following chemical forms can cyanide take?

Cyanide can exist in multiple chemical forms, which is why the identification of gas or crystal as the correct option is important. In its gaseous form, cyanide refers primarily to hydrogen cyanide (HCN), which is a highly volatile and toxic compound that can easily evaporate into gas. This makes it hazardous in gaseous environments.

In addition to its gaseous form, cyanide also appears in solid forms, particularly in the form of salts, such as potassium cyanide (KCN) and sodium cyanide (NaCN), which can crystallize. These solid forms are commonly used in various industrial applications.

Therefore, stating that cyanide can take the form of both gas and crystal accurately reflects the versatile nature of this compound across different states of matter. This multifaceted existence is crucial for understanding its behavior and hazards in different contexts.