Q.

Warming Ammonium chloride with sodium hydrochloride in a test tube is an example of –

A. Open system
B. Closed system
C. Isobaric system
D. Isothermal system
Answer» A. Open system
Explanation: When heated, ammonlinm chloride decomposes into ammonia and hydrogen chloride. The thermal decomposition of ammonium chloride is a reversible chemical change. On heating above 340°C, it decomposes to form two gases such as ammonia and hydrogen chloride. On cooling, the reaction is reversed and solid ammonium chloride is formed.
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