The reactivity of iron, magnesium, sodium and zinc towards water are in order as:

F e > M g > N a > Z n

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Z n > N a > M g > F e

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N a > M g > Z n > F e

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M g > N a > F e > Z n

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Solution

The correct option is B $N a > M g > Z n > F e$
Reactivity series is a list of metals arranged in decreasing order of their reactivity or activity based on displacement reactions conducted experimentally. It follows the order:
$N a > C a > M g > A l > Z n > F e$
Thus, option $C$ is correct.

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