Ammonia and hydrogen chloride gases are mixed. Which type of chemical reactions do they give?

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Solution

Reaction of ammonia and $HCl$ :
When ammonia $({NH}_{3})$ reacts with Hydrogen chloride $(HCl)$ , it results in the formation of salt i.e. Ammonium chloride $({NH}_{4} Cl)$ .
The chemical reaction can be depicted as:
${NH}_{3} (g) + HCl (g) \to {NH}_{4} Cl (s)$
It is a type of combination reaction because ammonia combines with Hydrogen chloride to form a single product i.e. Ammonium chloride.
The general description of a combination reaction is:
$X + Y \to XY$

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