Question

$4{\mathrm{NH}}_3\left(\mathrm{g}\right)+5{\mathrm{O}}_2\left(\mathrm{g}\right)\to 4\mathrm{NO}\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

The following reaction is an example of a/an

• A. Displacement Reaction
• B. Combination Reaction
• C. Redox Reaction
• D. Neutralization Reaction

Answer 1

The correct option is C

Redox Reaction

Explanation of correct option

Redox reactions or Reduction-Oxidation reactions:

Oxidation: The oxidation of a substance takes place when

1. There is the addition of oxygen to a substance.
2. There is the removal of hydrogen from a substance.
3. There is the addition of an electronegative element to a substance.
4. There is the removal of the electropositive element from a substance.

Reduction: The reduction of a substance takes place when

1. There is the addition of hydrogen to a substance.
2. There is the removal of oxygen from a substance.
3. There is the addition of an electropositive element to a substance.
4. There is the removal of an electronegative element from a substance.

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

The nitrogen of ammonia is getting oxidized with the addition of oxygen. and oxygen is getting reduced with the addition of hydrogen.

Both oxidation and reduction occur at the same time, the above reaction is referred to as a redox reaction.

Explanation of incorrect option:

Displacement Reactions: It involves the displacement of one of the constituents of a compound by another substance and may be regarded as a displacement reaction.

Example: $\underset{\mathrm{Iron}}{\mathrm{Fe}\left(\mathrm{s}\right)}+\underset{\mathrm{Copper}\mathrm{sulfate}}{\mathrm{CuSO}4(\mathrm{aq}.)}\to \underset{\mathrm{Iron}\mathrm{Sulfate}}{\mathrm{FeSO}4\left(\mathrm{aq}\right)}+\underset{\mathrm{Copper}}{\mathrm{Cu}\left(\mathrm{s}\right)}$

Addition Reactions: It is a union of two or more substances to form a new substance. It may be brought about by the application of heat, light, electricity, or pressure.
Example: $\underset{\mathrm{Hydrogen}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Chlorine}}{{\mathrm{Cl}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Hydrochloric}\mathrm{acid}}{2\mathrm{HCl}\left(\mathrm{l}\right)}$

Neutralization: It may be defined as a reaction between acid and base present in an aqueous solution to form salt and water.
$\underset{\mathrm{Hydrochloric}\mathrm{acid}}{\mathrm{HCl}(\mathrm{aq}.)}+\underset{\mathrm{Sodium}\mathrm{Hydroxide}}{\mathrm{NaOH}(\mathrm{aq}.)}\to \underset{\mathrm{Sodium}\mathrm{Chloride}}{\mathrm{NaCl}\left(\mathrm{aq}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

Hence, Option(C) is correct.