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Is the tarnishing (blackening) of silver a useful or harmful chemical change? Why?
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Silver is quite resistant to corrosion and does not oxidise easily, but it gets tarnished by atmospheric sulphurous gases. It reacts with hydrogen sulphide in the atmosphere and readily forms a surface tarnish of silver sulphide. ... So, tarnishing of silver is not desirable.
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Answer:
Tarnishing silver is useful chemical change because its helps in non rusting of silver
Explanation:
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