Ammonium chloride decomposes when it is heated, as shown by the equation. The two gases produced are then allowed to cool.
ammonium chloride ⇌ \rightleftharpoons\,⇌ ammonia + hydrogen chloride
What happens as the gases cool?
The ammonia and hydrogen chloride stay as two separate gases
The ammonia and hydrogen chloride react to form ammonium chloride
The ammonia and hydrogen chloride react to form nitrogen and chlorine
The ammonia and hydrogen chloride both decompose into their elements
40 exam-style questions on AQA GCSE Chemistry 6.2 Reversible reactions and dynamic equilibrium, covering 6.2.1 Reversible reactions, 6.2.2 Energy changes and reversible reactions, 6.2.3 Equilibrium, 6.2.4 The effect of changing conditions on equilibrium, 6.2.5 The effect of changing concentration, 6.2.6 The effect of temperature changes on equilibrium, and 6.2.7 The effect of pressure changes on equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.