Question

Name the constituent of air which is essential for combustion and respiration.

Answer 1

Oxygen gas is essential for combustion and respiration.

Combustion - The reaction of oxygen with a substance(fuel) that results in the release of heat and light is called combustion.

$\mathrm{Fuel}\left(\mathrm{s}\right)/\left(\mathrm{l}\right)/\left(\mathrm{g}\right)+\mathrm{Oxygen}\left(\mathrm{g}\right)\to \mathrm{Carbon}\mathrm{dioxide}\left(\mathrm{g}\right)+\mathrm{Heat}+\mathrm{Light}$

Respiration - The process by which organisms get energy by the conversion of glucose in the presence of oxygen into carbon dioxide and water vapour.

$\mathrm{Glucose}\left(\mathrm{s}\right)+\mathrm{Oxygen}\left(\mathrm{g}\right)\to \mathrm{Carbon}\mathrm{dioxide}\left(\mathrm{g}\right)+\mathrm{Water}\mathrm{vapour}\left(\mathrm{g}\right)+\mathrm{Energy}$