1.

Account for the following : (a) White silver chloride turns grey in sunlight. (b) Brown coloured copper powder on heating in air turns into black coloured substance.

Answer»

SOLUTION :(a) Silver CHLORIDE TURNS grey on exposure to sunlight because of the following reaction :
`2AgCl OVERSET("Sunlight")(to)underset("(grey)")underset("Metallic silver")(2Ag+Cl_(2))`
(b) Oxidation of copper powder takes PLACE. The oxide formed has a black colour.
`underset("Brown")(2Cu)+O_(2)overset("Heat")(to)underset("Black")(2CuO)`


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