Assertion: According to Bohr, angular momentum of an electron in an orbit is quantized.
Reason: Bohr's model of an atom could not explain Stark effect.

Both assertion and reason are correct. Reason is the correct explanation of the assertion

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Both assertion and reason are correct. Reason is not the correct explanation of the assertion

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Assertion is correct and reason is wrong

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Assertion is wrong and reason is correct

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Solution

The correct option is B Both assertion and reason are correct. Reason is not the correct explanation of the assertion
Assertion is correct, since for a Bohr orbit:
$Angular momentum (m v r) = \frac{n h}{2 π}$

Also it is true that Bohr's model could not explain splitting of spectral lines under the influence of electric field i.e. Stark effect.

However, the reason does not explain the assertion.

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Bohr's Model of a Hydrogen Atom

Standard XII Chemistry

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Assertion: According to Bohr, angular momentum of an electron in an orbit is quantized. Reason: Bohr's model of an atom could not explain Stark effect.

Assertion: According to Bohr, angular momentum of an electron in an orbit is quantized.
Reason: Bohr's model of an atom could not explain Stark effect.