Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II. Statement (I): A spectral line will be observed for a 2 p x rightarrow 2 p y transition. Statement (II): 2 p x and 2 p y are degenerate orbitals. In the light of the above statements, choose the correct answer from the options given below :

Statement-I is false but Statement-II is true.

Both Statement-I and Statement-II are true.

Both Statement-I and Statement-II are false.

Statement-I is true but Statement-II is false.

Chemistry · Structure of Atom

JEE Main 2025 — 22 January, Evening Shift — Question 38

Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II.

Statement (I): A spectral line will be observed for a $2 \mathrm{p}_{\mathrm{x}} \rightarrow 2 \mathrm{p}_{\mathrm{y}}$ transition.

Statement (II): $2 p_{x}$ and $2 p_{y}$ are degenerate orbitals.

In the light of the above statements, choose the correct answer from the options given below :

Option A:
Both Statement-I and Statement-II are true.
Option B:
Both Statement-I and Statement-II are false.
Option C:
Statement-I is true but Statement-II is false.
Option D:
Statement-I is false but Statement-II is true.
Correct

Answer: D

Step-by-step solution

A spectral line is observed only when there is a transition between two energy levels having different energies.

Statement (I): The orbitals $2p_x$ and $2p_y$ have the same energy. Therefore, a transition from $2p_x$ to $2p_y$ does not involve any energy change and no radiation is absorbed or emitted. Hence, Statement (I) is false.

Statement (II): The orbitals $2p_x$ , $2p_y$ and $2p_z$ possess the same energy in the absence of any external field. Therefore, they are degenerate. Hence, Statement (II) is true.

Thus, the correct answer is option D.

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Exam: JEE Main 2025
Paper: 22 January, Evening Shift
Subject: Chemistry
Chapter: Structure of Atom
Topic: Quantum Mechanical Model of Atom - Schrödinger

Niobium ( Nb) and ruthenium ( Ru ) have " x " and " y " number of electrons in their respective 4 d orbitals. The value of x+y is

Answer: D

Step-by-step solution

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