Reversible reactions in a sealed container

1 mark · Normal

Which process below best describes the decomposition of ammonium chloride, when heated in a sealed container?

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Correct option: NH4Cl(s) breaks down into NH3(g) and HCl(g), which cannot escape and can recombine to form NH4Cl(s).

Common mistakes: Choosing option 4 (products escape); Thinking it reacts with oxygen

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Marking points

A1 · 1 mark · Correct option selected

Worked solution

In a sealed container, NH4Cl(s) decomposes into NH3(g) and HCl(g). These gases cannot escape, so can recombine to form NH4Cl(s).