The most reactive metal among the following is:

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Solution

The correct option is A Fe
The reactivity series is sometimes quoted in the strict reverse order of standard electrode potentials, when it is also known as the "electrochemical series":

$L i > C s > R b > K > B a > S r > N a > C a > M g > B e > A l > H (w a t e r) > M n > Z n > C r > F e > C d > C o$
$> N i > S n > P b > H (i n a c i d s) > C u > F e (+ 3) > H g > A g > P d > I r > P t > A u$

So, according to this series, Iron is most reactive than $P t, N i, C o$

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