JEE Main 2026 — Structure of Atom Question with Solution
JEE Main 2026 (05 April Shift 1)
Question
Identify the correct statements from the following:
A. Heisenberg uncertainty principle is applicable to electrons.
B. The size of orbital is less than the size of orbital.
C. The energy of orbital of H atom is equal to the energy of orbital of Li.
D. The electronic configuration of Cr is
Choose the correct answer from the options given below:
A. Heisenberg uncertainty principle is applicable to electrons.
B. The size of orbital is less than the size of orbital.
C. The energy of orbital of H atom is equal to the energy of orbital of Li.
D. The electronic configuration of Cr is
Choose the correct answer from the options given below:
Choose an option
Show full solutionCorrect option: B
Correct answer
BA, B and D Only
Step-by-step explanation
Statement A is correct. Heisenberg's uncertainty principle is applicable to microscopic particles such as electrons.
Statement B is correct. The size of an orbital increases with an increase in the principal quantum number . Thus, the size of the orbital is greater than that of the orbital.
Statement C is incorrect. The energy of an orbital depends on the effective nuclear charge. Since the nuclear charge of Li () is greater than that of H (), the energy of the orbital of Li is lower than that of the orbital of H.
Statement D is correct. Chromium () has an anomalous electronic configuration of due to the extra stability of the half-filled -subshell.
Therefore, statements A, B, and D are correct.
Answer: A, B and D Only
Statement B is correct. The size of an orbital increases with an increase in the principal quantum number . Thus, the size of the orbital is greater than that of the orbital.
Statement C is incorrect. The energy of an orbital depends on the effective nuclear charge. Since the nuclear charge of Li () is greater than that of H (), the energy of the orbital of Li is lower than that of the orbital of H.
Statement D is correct. Chromium () has an anomalous electronic configuration of due to the extra stability of the half-filled -subshell.
Therefore, statements A, B, and D are correct.
Answer: A, B and D Only
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This is a previous-year question from JEE Main 2026, covering the Structure of Atom chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.