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Which is the correct order of reactivity series?

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a

Mg < Ca < Na < K

b

K < Na < Ca < Mg

c

K < Mg < Na < Ca

d

Mg < Ca < Na < K

answer is A.

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Detailed Solution

The correct order of reactivity series Mg < Ca < Na < K.
The reactivity series gives the reactivity of metals. As we know, potassium is the most reactive metal; hence, it is placed at the top, followed by sodium, which is also highly reactive to water and moisture in the air then calcium and magnesium come down in the series. Therefore, as potassium is placed at the top of the series, it is the most reactive metal, and magnesium is the least reactive metal.

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