Question

During ______, at a temperature of about $3000°\mathrm{C}$, Nitrogen combines with Oxygen to form Nitric oxide.

• A. Combustion
• B. Burning
• C. Oxidation
• D. Lighting

Answer 1

The correct option is D

Lighting

The explanation for the correct option:

(D) Lighting

• Nitrogen($\mathrm{N}$) does not combines with Oxygen($\mathrm{O}$) to form Nitric oxide($\mathrm{NO}$) at room temperature.
• Lighting helps to provide enough temperature that is required by the above reaction.
• $\underset{\mathrm{Nitrogen}}{{\mathrm{N}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\stackrel{3000°\mathrm{C}}{\to }\underset{\mathrm{Nitric}\mathrm{oxide}}{2\mathrm{NO}\hspace{0.17em}\left(\mathrm{g}\right)}$

The explanation for the incorrect option:

(A) Combustion:

• In Combustion, a substance burns in the presence of Oxygen, giving off heat and light in the process.
• For example, $\underset{\mathrm{Methane}}{{\mathrm{CH}}_4\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

(B) Burning:

• It means a substance is set on fire.
• There is only one difference between combustion and burning i.e. In burning flame will be there but in combustion, there will be no flame.

(C) Oxidation:

• It is a process that involves the addition of oxygen or the removal of hydrogen and it terms of electrons it is the loss of electrons.
• For example, $\underset{\mathrm{Carbon}}{\mathrm{C}\left(\mathrm{s}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}$

Thus, the correct option is option (D).