Discussion
Why do silver articles turn black when kept in the open for a few days?
Answer: B
Silver turns black due to reaction with hydrogen sulphide present in air.
Silver reacts with traces of hydrogen sulphide gas in the air to form a thin black layer of silver sulphide. This tarnishing is a form of corrosion.
Silver is a noble metal and does not react with oxygen in air under ordinary conditions, so the oxygen option is wrong. Nitrogen oxides and carbon monoxide are not what blackens silver articles. Compare copper, which gains a green coating from moist carbon dioxide and air.
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