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A : in third energy level there is n...

A : in third energy level there is no -f- subshell .
R : For n=3 the possible values of l are 0,1,2 and for f- subshell l = 3. .

A

IF both assertion & reason are true and the reason is the correct explanation of the assertion then mark

B

IF both assertion & reason are true but the reason is not the correct explanation of the assertion , then mark

C

IF assertion is true statement but reason is false , then mark

D

If both assertion and reason are false statements then mark

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion (A) and the reason (R) provided. ### Step 1: Understand the Assertion (A) The assertion states that "in the third energy level there is no f subshell." - The third energy level corresponds to the principal quantum number \( n = 3 \). - The possible azimuthal quantum number \( l \) values for a given \( n \) are from \( 0 \) to \( n-1 \). - For \( n = 3 \), the possible values of \( l \) are \( 0, 1, 2 \), which correspond to the s, p, and d subshells respectively. ### Step 2: Understand the Reason (R) The reason states that "for \( n = 3 \), the possible values of \( l \) are \( 0, 1, 2 \) and for f subshell \( l = 3 \)." - This is correct because the f subshell corresponds to \( l = 3 \). - Since the maximum value of \( l \) for \( n = 3 \) is \( 2 \), there cannot be an f subshell in this energy level. ### Step 3: Conclusion Both the assertion and the reason are true. However, the reason correctly explains the assertion. Thus, we can conclude that: - Assertion (A) is true. - Reason (R) is true and provides the correct explanation for (A). ### Final Answer Both the assertion and reason are true, and the reason is the correct explanation of the assertion. ---
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