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the jewellery will react in air to form its oxide .. the process involved is corrosion.. the value possessd by anita is the awareness about some chemical reaction s
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1. The jwellery made of silver reacted with the sulphur dioxide gas present in the atmosphere and corroded anf became black.
2. This process is known as corrosion.
3. Anita shows the value of helpfulness towards everyone.
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