Q.

Given below are two statements:

Statement I: A spectral line will be observed for a 2px2py transition.

Statement II: 2px and 2py are degenerate orbitals.

In the light of the above statements, choose the correct answer from the options given below:                 [2025]

1 Both Statement I and Statement II are true  
2 Statement I is true but Statement II is false  
3 Both Statement I and Statement II are false  
4 Statement I is false but Statement II is true  

Ans.

(4)

Spectral line is observed when an electron makes a transition between two orbitals of different energy. As 2px and 2py have same energy (called degenerated orbitals), no spectral line is observed by transition of an electron between these two orbitals.