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Why do silver articles turn black after some time?
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(A) The slow and gradual degradation of metals due to their reaction with moisture, acids etc. present in the atmosphere is called corrosion. (1 Mark)
(B) Silver articles react with sulphur in the air to form a coating of silver sulphide, which is black in colour. (1 Mark)
(C)
$\bullet$ A – Carbon dioxide/ $\ce{CO2}$ (1 Mark)
$\bullet$ Green coating is of copper carbonate/ $\ce{CuCO3}$ (1 Mark)
(B) Silver articles react with sulphur in the air to form a coating of silver sulphide, which is black in colour. (1 Mark)
(C)
$\bullet$ A – Carbon dioxide/ $\ce{CO2}$ (1 Mark)
$\bullet$ Green coating is of copper carbonate/ $\ce{CuCO3}$ (1 Mark)