Q.52. Which of the following statement(s) is/are true ? (A) If two orbitals have the same value of (

Q: What is the correct answer for JEE Main Chemistry Q52?

The correct answer is B. (A) If two orbitals have the same value of (n + l), the orbital with lower value of n will have lower energy. This is the (n+l) rule or Aufbau principle, which is generally true for multi-electron atoms. For example, for (n+l)=5, 3d (n=3, l=2) and 4p (n=4, l=1). 3d has lower n and lower energy than 4p. So, statement (A) is true. (B) Energies of the orbitals in the same subshell increase with incre

Q: Q.52. Which of the following statement(s) is/are true ? (A) If two orbitals have the same value of (n + l), the orbital with lower value of n will have lower energy. (B) Energies of the orbitals in…

The correct answer is B. (A) If two orbitals have the same value of (n + l), the orbital with lower value of n will have lower energy. This is the (n+l) rule or Aufbau principle, which is generally true for multi-electron atoms. For example, for (n+l)=5, 3d (n=3, l=2) and 4p (n=4, l=1). 3d has lower n and lower energy than 4p. So, statement (A) is true. (B) Energies of the orbitals in the same subshell increase with incre

Q: What are the options for this JEE Main Chemistry question?

A. A, B and C only · B. A and C only · C. C and D only · D. A only

Question

Q.52. Which of the following statement(s) is/are true ? (A) If two orbitals have the same value of (n + l), the orbital with lower value of n will have lower energy. (B) Energies of the orbitals in the same subshell increase with increase in atomic number. (C) The size of 2p, orbital is less than the size of 3p orbital. (D) Among 5f,6s, 4d, 5p and 5d orbitals, none of the orbitals have 2 radial nodes. Choose the correct answer from the options given below:

FirstInTest · Accepted Answer

(A) If two orbitals have the same value of (n + l), the orbital with lower value of n will have lower energy. This is the (n+l) rule or Aufbau principle, which is generally true for multi-electron atoms. For example, for (n+l)=5, 3d (n=3, l=2) and 4p (n=4, l=1). 3d has lower n and lower energy than 4p. So, statement (A) is true.
(B) Energies of the orbitals in the same subshell increase with increase in atomic number. This statement is false. For a given subshell (e.g., 1s, 2s, 2p), the energy of the orbital *decreases* with an increase in atomic number (Z) due to increased nuclear attraction. For example, the energy of 1s in H is higher than in He+.
(C) The size of 2p orbital is less than the size of 3p orbital. This is true. As the principal quantum number (n) increases, the average distance of the electron from the nucleus increases, leading to a larger orbital size. So, 3p is larger than 2p.
(D) Among 5f, 6s, 4d, 5p and 5d orbitals, none of the orbitals have 2 radial nodes. The number of radial nodes is given by $n - l - 1$.
For 5f: n=5, l=3. Radial nodes = $5 - 3 - 1 = 1$.
For 6s: n=6, l=0. Radial nodes = $6 - 0 - 1 = 5$.
For 4d: n=4, l=2. Radial nodes = $4 - 2 - 1 = 1$.
For 5p: n=5, l=1. Radial nodes = $5 - 1 - 1 = 3$.
For 5d: n=5, l=2. Radial nodes = $5 - 2 - 1 = 2$.
Since 5d orbital has 2 radial nodes, the statement "none of the orbitals have 2 radial nodes" is false.

So, statements (A) and (C) are true. The options are given as (1) A, B and C only (2) A and C only (3) C and D only (4) A only. Therefore, option (2) is the correct answer.

Answer

A, B and C only

Answer

A and C only

Answer

C and D only

Answer

A only

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