JEE Main 2026 — Structure of Atom Question with Solution
JEE Main 2026 (23 January Shift 2)
Question
Identify the INCORRECT statements from the following:
A. Notation represents 24 protons and 12 neutrons.
B. Wavelength of a radiation of frequency is .
C. One radiation has wavelength and energy . Other radiation has wavelength and energy .
D. Number of photons of light of wavelength 2000 pm that provides 1 J of energy is .
Choose the correct answer from the options given below:
A. Notation represents 24 protons and 12 neutrons.
B. Wavelength of a radiation of frequency is .
C. One radiation has wavelength and energy . Other radiation has wavelength and energy .
D. Number of photons of light of wavelength 2000 pm that provides 1 J of energy is .
Choose the correct answer from the options given below:
Choose an option
Show full solutionCorrect option: C
Correct answer
CA and C Only
Step-by-step explanation
Checking each statement:
(A) states has 24 protons, but the mass number is 24 and atomic number is 12, so this is INCORRECT.
(B) Using m, which is CORRECT.
(C) For nm and nm, since energy is inversely proportional to wavelength, , not as stated, so this is INCORRECT.
(D) For photons at pm, energy per photon is J, giving photons for 1 J, which is CORRECT.
The incorrect statements are A and C.
(A) states has 24 protons, but the mass number is 24 and atomic number is 12, so this is INCORRECT.
(B) Using m, which is CORRECT.
(C) For nm and nm, since energy is inversely proportional to wavelength, , not as stated, so this is INCORRECT.
(D) For photons at pm, energy per photon is J, giving photons for 1 J, which is CORRECT.
The incorrect statements are A and C.
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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.