The number of correct statements from the following is :

A. For 1s orbital, the probability density is maximum at the nucleus.
B. For 2s orbital, the probability density first increases to maximum an

Question

The number of correct statements from the following is :

A. For 1s orbital, the probability density is maximum at the nucleus.
B. For 2s orbital, the probability density first increases to maximum and then decreases sharply to zero.
C. Boundary surface diagrams of the orbitals enclose 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.

Canvas Classes · Accepted Answer

Evaluate each statement:

A. ✓ Correct — For 1s,  is maximum at  (nucleus).

B. ✗ Incorrect — For 2s, probability density starts at a maximum at nucleus, decreases to zero (radial node), then increases to a second maximum, then decreases. It does NOT "first increase".

C. ✗ Incorrect — Boundary surface diagrams enclose ~90% probability, not 100% (the orbital extends to infinity).

D. ✓ Correct — p-orbitals have  → 1 angular node; d-orbitals have  → 2 angular nodes.

E. ✓ Correct — For p-orbitals

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