Question

Explain two ways by which food industries prevent rancidity.
Discuss the importance of decomposition reaction in metal industry with three points.

Answer 1

Rancidity is complete (or) incomplete oxidation (or) hydrolysis of fats and oils when exposed to air light moisture loss by bacterial action resulting in an unpleasant taste.

$a)$ $1)$ It can be presented by adding antioxidants to food containing fat and oil ex hydroxy anisole is added to butter.

$2)$ It can be presented by packing fat and oil containing foods in nitrogen gas.

$b)$ $1)$ Nolten $Nacl$ is hydroelectrically decomposed to form sodium metal.

$2)$ aluminum metal is obtained by electric decomposition of bauxite (or) mixed with Cryolite

$3)$ Carbonateores are thermally decomposed to give metal oxide which on reduction give metal.