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Which of the following statements are true ? (A) The subsidiary quantum number A describes the shape of the orbital occupied by the electron. (B) is the boundary surface diagram of the 2px orbital. (C) The + and – signs in the wave function of the 2px orbital refer to charge. (D) The wave function of 2px orbital is zero everywhere in the xy plane.

1. (B) and (D) only
2. (C) and (D) only
3. (A) and (B) only
4. (A), (B) and (C) only

Correct answer: (A) and (B) only

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