The number of correct statements from the following ______ A. For 1s orbital, the probability density is maximum at the nucleus. B. For 2 s orbital, the probability density first increases to maximum and then decreases sharply to zero. C. Boundary surface diagrams of the orbitals encloses a region of 100% probability of finding the electron. D. p and d-orbitals have 1 and 2 angular nodes respectively. E. Probability density of p-orbital is zero at the nucleus.
Answer: 3
Solution
Statement A: Correct. For 1s orbital, probability density (ψ²) is maximum at the nucleus.
Statement B: Incorrect. For 2s orbital, probability density first decreases from the nucleus, then increases to a maximum, then decreases again.
Statement C: Incorrect. Boundary surface diagrams typically enclose a region of ~90-95% probability, not 100%.
Statement D: Correct. p-orbitals have 1 angular node, d-orbitals have 2 angular nodes.
Statement E: Correct. p-orbitals have a node at the nucleus, so probability density is zero there.
