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Did you notice the colour coating on sil...

Did you notice the colour coating on silver and copper articles?

Text Solution

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1) Yes, I noticed.
2) When these metals are exposed to moisture, acids, etc. they tarnish due to the formation of oxide on the surface. This process is called corrosion.
3) This metla oxide looks like a coating on the metals.
4) To prevent corrosion a layer like coating of paints should be applied.
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Silver is monovalent and has atomic mass of 108. Copper is divalent and has an atomic mass of 63.6. The same electric current is passed for the same length of time through a silver couloment and a copper coulometer. If 27.0 g of silver is deposited, then the corresponding amount of copper deposited is