Question

Account for the following:

(i) White silver chloride turns grey in sunlight.

(ii)Brown coloured copper powder on heating in air turns into

black coloured substance.

(iii)Chips packets are flushed with nitrogen gas.​

Answer 1

Explanation:

i) this is due to photolytic decomposition when silver chloride is exposed to sunlight it gives its chloride back and get converted into silver metal

ii) black coloured copper powder on heating in air turns into black coloured substance this is because copper on heating reacts with oxygen present in air to get converted into copper oxide

iii) chips packet are flushed with Nitrogen gas to prevent rancidity and to ensure that the food does not become rancid and its smell and taste does not changes