Assertion :Alkaline earth metals have lower densities than alkali metals. Reason: Atomic radii of alkaline earth metals are larger than that of corresponding alkali metals.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is D Both Assertion and Reason are incorrect.
Alkaline earth metals have higher densities than alkali metals due to smaller radius and more particles.
Atomic radii of alkaline earth metals are smaller than that of corresponding alkali metals.

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Assertion :Alkaline earth metals have lower densities than alkali metals. Reason: Atomic radii of alkaline earth metals are larger than that of corresponding alkali metals.

The correct option is D Both Assertion and Reason are incorrect.Alkaline earth metals have higher densities than alkali metals due to smaller radius and more particles.Atomic radii of alkaline earth metals are smaller than that of corresponding alkali metals.

The correct option is D Both Assertion and Reason are incorrect.
Alkaline earth metals have higher densities than alkali metals due to smaller radius and more particles.
Atomic radii of alkaline earth metals are smaller than that of corresponding alkali metals.