Standard Books Chemistry Bohr's Model MCQ Question with Solution

An electron is revolving in the nᵗʰ orbit of radius 4.2 Å, then the value of n is (r₁ = 0.529 Å)

A

4

B

5

C

6

D

3

Option D

The radius of the orbit is proportional to n². By comparing the given radius with the known value, we find n ≈ 3.

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STANDARD Chemistry Bohr's Model MCQ Question