Chemistry · 2026
JEE Main · 23 January 2026, Shift 2 · Q52
Identify the INCORRECT statements from the following: A. Notation _12^24 Mg represents 24 protons and 12 neutrons. B. Wavelength of a radiation of…
Identify the INCORRECT statements from the following:
A. Notation $\displaystyle { }_{12}^{24} \mathrm{Mg}$ represents $\displaystyle 24$ protons and $\displaystyle 12$ neutrons.
B. Wavelength of a radiation of frequency $\displaystyle 4.5 \times 10^{15} \mathrm{~s}^{-1}$ is $\displaystyle 6.7 \times 10^{-8} \mathrm{~m}$.
C. One radiation has wavelength $\displaystyle =\lambda_1(900 \mathrm{~nm})$ and energy $\displaystyle =\mathrm{E}_1$. Other radiation has wavelength $\displaystyle =\lambda_2(300 \mathrm{~nm})$ and energy $\displaystyle =\mathrm{E}_2 . \mathrm{E}_1: \mathrm{E}_2=3: 1$.
D. Number of photons of light of wavelength $\displaystyle 2000$ pm that provides $\displaystyle 1$ J of energy is $\displaystyle 1.006 \times 10^{16}$.
Choose the correct answer from the options given below:
Official answer
From NTA’s final answer key for this paper.
(2)
$\displaystyle A$ and C Only
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JEE Main 2026 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.