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In nature aluminium is found in the form of its compounds while gold is found in free state. Give reasons.


Aluminium finds place higher up in the activity series and is thus quite reactive and is found as compounds in nature while gold is just at the bottom in the activity series and is thus least reactive. It does not react with other metal thus found in free state in nature.


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How would you show that silver is chemically less reactive than copper?

Why should we not throw small sodium pieces into a sink in the laboratory?

A solution of copper sulphate was kept in an iron pot. After a few days, the iron pot was found to have a number of holes in it. Write the equation of the reaction that took place. Explain this reaction in terms of reactivity.

Explain the terms:
(a) Anodising
(b) Aqua regia.


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