Q105 · CSIR NET Chemistry, December 2013
Paper: CSIR NET December 2013 · Subject: Physical Chemistry · Chapter: Quantum Chemistry · Topic: Hydrogen Atom · Marks: 2 · Difficulty: Medium
The most probable value of 'r' for an electron in 1s orbital of hydrogen atom is
(a)$a_{0} / 2$
(b)$a_{0}$
(c)$\sqrt{2} a_{0}$
(d)$3 a_{0} / 2$
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
The radial distribution 4πr²|ψ₁ₛ|² peaks at r = a₀ (Bohr radius); the mean value is 1.5a₀.
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