Question

The following reaction is an example of a: $4{\mathrm{NH}}_3\left(\mathrm{g}\right)+5{\mathrm{O}}_2\left(\mathrm{g}\right)\to 4\mathrm{NO}\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralization reaction

• A. (i) and (iv)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (iii) and (iv)

Answer 1

The correct option is C

(i) and (iii)

Explanation:

C. (i) and (iii)

Displacement reaction:

• It is a type of reaction in which one element is replaced by another in a compound.
• The general description of displacement reaction can be given as:

$\mathrm{A}+\mathrm{B}\to \mathrm{C}+\mathrm{D}$

• The given reaction is an example of a displacement reaction is:

$$\begin{gathered} 4{\mathrm{NH}}_3\left(\mathrm{g}\right)+5{\mathrm{O}}_2\left(\mathrm{g}\right)\to 4\mathrm{NO}\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right) \\ \left(\mathrm{Ammonia}\right)\left(\mathrm{Oxygen}\right)(\mathrm{Nitric}\mathrm{oxide})\left(\mathrm{Water}\right) \end{gathered}$$

• This is a displacement reaction, as the ions get exchanged within other compounds.

Redox reaction:

• The reaction in which oxidation and reduction take place simultaneously is known as the Redox reaction.
• In the given reaction, $4{\mathrm{NH}}_3\left(\mathrm{g}\right)+5{\mathrm{O}}_2\left(\mathrm{g}\right)\to 4\mathrm{NO}\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$
• In this reaction, the Nitrogen of ammonia is getting oxidized with the addition of oxygen while oxygen gets reduced.

Thus, the given reaction is both a displacement as well as a redox reaction.

• In a combination reaction, two or more reactants react together to produce new products.
• In a neutralization reaction, acid and base react to form salt and water.

Hence, the correct option is C i.e. (i) and (iii).