Question

Why do all the metals pieces gets polished before the experiments

Answer 1

Hey fella, here is your answer :-----

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If it was nonmetals the material would shatter! Maximum metals are ductile means they can be drawn out for making wire. All metals pieces get polished before the experiment because to remove the layer of metal oxide.
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Answer 2

HOLA USER
HERE'SUSHILA YOUR ANSWER

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The metal pieces are polished before experiments to remove the oxide layer formed by oxygen present in the air

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