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my question was attached in image.
pls tell me fast all three questions it is urgent.
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a.jewellery react with moisture present in the air and also with oxygen therefore it becomes black.
b.the process is called corrosion.
c.values shown by Anita are that jewellery kept in a scaled box and not to exposed in air.
a. The jwellery became black because it reacts with sulphur present in air .
b. The process is called oxidation.
c Anita was conscious about the scientific attribute ,and is caring friend .