Arrange Na, Mg, Zn, and Fe in the increasing order of reactivity.

N a < M g < Z n < F e

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M g < Z n < F e < N a

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Z n < F e < M g < N a

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F e < Z n < M g < N a

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Solution

The correct option is D $F e < Z n < M g < N a$
The series obtained by arranging some of the metals in the decreasing order of their reactivity is known as the reactivity series. According to it, Na is more reactive than Mg which is, in turn, more reactive than Zn and the least reactive is Fe among the given options.

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