Question

Assertion :The angular momentum of an electron in an atom is quantized. Reason: In an atom only those orbits are permitted in which angular momentum of the electron is integral multiple of $\frac{h}{2\pi }$, where h is a plank's constant.

• 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

According to Bohr's postulates, the angular momentum of an electron (mvr)is an integral multiple of $\frac{h}{2\pi }$
Thus, $mvr=\frac{nh}{2\pi }$
Only those orbitals are permitted which satisfy the above equation.
Hence, the angular momentum of an electron in an atom is quantized.