IIT-JEE 2010 · Paper 2 · Chemistry Q17

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ChemistrySingle correct+3 / -1Question 17 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 orbital angular momentum quantum number of the state $S_2$ is

Answer and worked solution

Official answer: B

Principal quantum number of $S_2$ . Its energy equals $E_H$ : $\dfrac{9}{n^2}=1$ , so $n=3$ .

One radial node. $n-l-1=1$ gives $l=1$ (a 3p state).

(B)

Topics:Quantum numbers Bohr model

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IIT-JEE 2010 · Paper 2, Chemistry question 17