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Long answer·Standard multi-step (3/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

Check whether the following quantum-number sets are possible: P: n=2,l=1,ml=0,ms=+1/2n=2,l=1,m_l=0,m_s=+1/2; Q: n=2,l=2,ml=0,ms=−1/2n=2,l=2,m_l=0,m_s=-1/2; R: n=3,l=0,ml=1,ms=+1/2n=3,l=0,m_l=1,m_s=+1/2.
Total: 5 marks

(a) Judge P. (1 mark)

(b) Judge Q. (2 marks)

(c) Judge R. (2 marks)

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cbse-chemistry-11.u2.t2-4.laq.009

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