Question

Select the combination reactions between: (i) elements, (ii) compounds and (iii) an element and a compound, for the given reaction.

$$\begin{gathered} {\mathrm{NH}}_3\left(\mathrm{g}\right)+\mathrm{HCl}\left(\mathrm{g}\right)\to {\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right) \\ \left(\mathrm{Ammonia}\right)(\mathrm{Hydrochloric}(\mathrm{Ammonium} \\ \mathrm{acid})\mathrm{chloride}) \end{gathered}$$

Answer 1

Combination reactions:

The reactions in which the elements or compounds combine together to form one or more products are called combination reactions. The combination reactions are of different kinds, depending on the elements or compounds taking part in the reaction.

Compounds and elements:

The compounds are molecules composed of different atoms or elements. The elements are the purest form of an atom.

Given equation:
The given reaction is a combination reaction of the compounds Ammonia $\left({\mathrm{NH}}_3\right)$ and Hydrochloric acid $\left(\mathrm{HCl}\right)$ to give Ammonium chloride $\left({\mathrm{NH}}_4\mathrm{Cl}\right)$.

$$\begin{gathered} {\mathrm{NH}}_3\left(\mathrm{g}\right)+\mathrm{HCl}\left(\mathrm{g}\right)\to {\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right) \\ \left(\mathrm{Ammonia}\right)(\mathrm{Hydrochloric}(\mathrm{Ammonium} \\ \mathrm{acid})\mathrm{chloride}) \end{gathered}$$

Therefore, the given reaction is a combination of (ii) compounds.