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.
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(a) White Silver Chloride (AgCl) turns grey in sunlight because of Photolysis or Photolytic decomposition in the presence of sunlight. => Silver Chloride decomposes to form Silver and Chloride.
(b) Brown coloured copper powder on heating in air turns into a black substance, this black substance is copper oxide.
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