Which of the following statements is not correct?

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The alkaline earth metals are harder and denser than alkali metals

The melting and boiling points of alkaline earth metals are higher than the corresponding nearby alkali metals

Alkaline earth metals are too reactive to occur freely in nature

Magnesium and calcium can be obtained by chemical reduction of their compounds.

answer is D.

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Detailed Solution

Reduction potential values of these metals are so high, which makes them very strong reducing agents. As a result other reducing agents cannot reduce the compounds of alkali and alkaline earth metals. This leads to no reduction of them. That's why they cannot be obtained by chemical reduction methods.

Magnesium and calcium are obtained by electrolytic reduction.

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