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CBSE Class 10 Answered

Assertion- Silver articles become coated with a black layer upon exposure to air.

Resaon- A layer of oxide gets deposited upon oxidation with air.

A- Assertion and Reason both are correct and reason is the correct explanation of assertion.

B- Assertion and Reason both are correct and reason is not the correct explanation of assertion.

C- Assertion is true but reason is false.

D- Reason is true but assertion is false

Please provide an explanation too.

Asked by vandanawasan02 | 13 Feb, 2020, 09:24: AM
Expert Answer
 When silver is exposed to air, it becomes black due to sul;phide coating, although silver is not very reactive metal but with passage of time, it slowly reacts with oxygen in the air and forms silver oxide. Black color of layer is formed when it oxidises in Silver sulphide.
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