Question

When copper utensils, iron nails or silver ornaments are kept in open, what happens?
Find out the reason for them. Note down your observation.
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Answer 1

Answer:

If copper utensils , iron nails or metal ornaments kept open to atmosphere, they corrode. Explanation: Corrosion is the process of depletion of metal (from metal surfaces) with time due to the reaction between the metal and oxygen (or any gas according to the metal) and water.

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Answer 2

When copper utensils,iron nails or silver  ornaments are kept in open ,being metals they react with the oxygen and moisture present in air to form hyderated iron oxide called rust.