Assertion :There are two spherical nodes in $3 s$ -orbital. Reason: There is no planar node in $3 s$ -orbital.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Number of nodes $= n + l - 1 ∴$ for $3 s = 3 + 0 - 1 = 2$
Number of spherical nodes $= n + l ∴$ for $3 s = 3 - 1 = 2$
Number of planar nodes $= l ∴$ for $3 s = 0$
Thus both assertion and reason are correct but reason does not explain assertion
$∴$ answer is option B.

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Assertion :There are two spherical nodes in 3s-orbital. Reason: There is no planar node in 3s-orbital.

Assertion :There are two spherical nodes in $3 s$ -orbital. Reason: There is no planar node in $3 s$ -orbital.