Harish took metal samples of Fe,Zn,Al,Cu...

Harish took metal samples of Fe,Zn,Al,Cu and Pb in separate test tube. And added hydrochloric acid in each of them.
(a) Arrange the metals in the decreasing order of their reactivity.

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(i) The reactivity decreases in the order of `Al>Zn>Fe>Pb>Cu`.

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