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Question

Assertion :Density of potassium is lower than sodium. Reason: Density decreases from top to bottom in a group.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is C Assertion is correct but Reason is incorrect
The density of alkali metal elements increases down the group but there is exception for K and Na as the increase in size is high compared to the increase in weight in the case of K which makes the density of K less.

So, the correct option is C.

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