Question

Assertion :Angular momentum of the electron in the orbit which has four subshell is $\frac{2h}{\pi }$. Reason: Angular momentum of electron is quantized.

Read the above assertion and reason and choose the correct option regarding it.

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

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Angular momentum of an electron is $mvr=\frac{nh}{2\pi }$. Where $n$ is shell.

The shell with four subshells is the 4th shell. So $n$ is 4.

So angular momentum of an electron in 4th shell is $mvr=\frac{4h}{2\pi }$.

$mvr=\frac{2h}{\pi }$.

So angular momentum of the electron is quantized.

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

Hence option A is correct.