Incorrect Statement for 1s Electron | JEE Mains PYQ | Structure of Atom
Q. Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect?

(Bohr's radius is represented by a0)

A. The probability density of finding the electron is maximum at the nucleus
B. The total energy of the electron is maximum when it is at a distance a0 from the nucleus
C. The electron can be found at a distance 2a0 from the nucleus
Explanation
Step 1: Analyze statement A

For 1s orbital, probability density is maximum at the nucleus. Hence, statement A is correct.

Step 2: Analyze statement C

Electron in 1s orbital has a finite probability of being found at distances greater than a0, including 2a0. So, statement C is correct.

Step 3: Analyze statement B

The total energy of the electron in a given orbital is fixed and does not depend on its distance from the nucleus.

Hence, statement B is incorrect.

Correct Answer = B

Previous Year Questions
For electrons in ‘2s’ and ‘2p’ orbitals, the orbital angular momentum values, respectively, are :
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The quantity which changes with temperature is :
9.3 g of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the reaction is 100% completed is ______ × 10⁻¹ g.
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Updated for JEE Main 2026: This PYQ is important for JEE Mains, JEE Advanced and other competitive exams. Practice more questions from this chapter.

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