33. What happens when
(a) Silver article is kept in the open for few days
(b) Copper nitrate undergoes heating
(c) Aluminium metal is added to dilute hydrochloric acid
- (d) Molten NaCl is electrolysed
(e) Tron sulphate reacts with zinc metal
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when silver articles kept in open becomes black in colour which is called silver sulphide AgS
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