Which one among the following is the most reactive metal?

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Answer is Wrong!

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UPSC CISF-AC-EXE – 2023

The reactivity of alkali metals increases down the group (K > Na) and alkali earth metals are generally less reactive than alkali metals. Comparing the given options, the standard reactivity series shows Potassium (K) is more reactive than Sodium (Na), which is more reactive than Calcium (Ca), which is more reactive than Magnesium (Mg). Therefore, Potassium (K) is the most reactive metal among the given choices.

– Reactivity of metals is related to their tendency to lose electrons (become oxidized).
– Alkali metals (Group 1) are generally more reactive than alkaline earth metals (Group 2).
– Within alkali metals, reactivity increases down the group.
– Within alkaline earth metals, reactivity generally increases down the group (though sometimes variations occur, but the general trend holds for Ca vs Mg).
– The order of reactivity for the given options is approximately K > Na > Ca > Mg.

Reactivity series can be determined experimentally (e.g., reaction with water, air, acids) or understood based on electronic configuration and ionization energies. Metals higher in the reactivity series can displace metals lower in the series from their compounds.

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