IIT-JEE 2010 · Paper 2 · Chemistry Q15

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ChemistrySingle correct+3 / -1Question 15 of 57

Passage

Paragraph for Questions 15 to 17

The hydrogen-like species $\ce{Li^{2+}}$ is in a spherically symmetric state $S_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $S_2$ . The state $S_2$ has one radial node and its energy is equal to the ground state energy of the hydrogen atom.

The state $S_1$ is

Answer and worked solution

Official answer: B

Spherically symmetric means $l=0$ (an s state). One radial node means $n-l-1=1$ , so $n=2$ .

$S_1$ is 2s.

(B)

Topics:Quantum numbers Orbitals and their shapes

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IIT-JEE 2010 · Paper 2, Chemistry question 15