NEET 2026 (Phase 1) · ChemistryMagnetismPrevious Year Question
The calculated spin only magnetic moment of \ce{Cr^2+} ion is:
- A.(a) $5.92$ BM
- B.(b) $2.84$ BM
- C.(c) $3.87$ BM
- D.(d) $4.90$ BM✓
Correct Answer
(D) (d) $4.90$ BM
Solution & Explanation
\textbf{Answer:} (d) $4.90$ BM. \textbf{Solution:} \ce{Cr^2+} has the configuration \ce{[Ar] 3d^4}, so it has $n = 4$ unpaired electrons. Using the spin-only formula: $\mu = \sqrt{n(n+2)} = \sqrt{4(4+2)} = \sqrt{24} = 4.90$ BM. Hence option (d) is correct.
🎯
Practice NEET 2026 (Phase 1) Chemistry — free, with instant solutions
10,000+ NEET PYQs solved step-by-step, chapter-wise, in the MedicNEET app.
More NEET PYQ solutions
ChemGiven below are two statements: Statement I: Ferromagnetism is considered as an extreme form of paramagnetism. Statement II: The number of unpaired electrons in a \ce{Cr^2+} ion (Z = 24) is the same as that of a \ce{Nd^3+} ion (Z = 60). In the light of the above statements, choose the correct answer from the options given below:ChemThe calculated 'spin-only' magnetic moment of \ce{Ti^2+} (\ce{3d^2}) is:ChemThe correct order of decreasing acidity of the following aliphatic acids is:ChemWhich one of the following reactions does NOT belong to Lassaigne's test?ChemHow many products (including stereoisomers) are expected from the monochlorination of 2-methylbutane, $\ce{(CH3)2CH-CH2-CH3}$?ChemThe total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula $\ce{C4H8O}$ is:ChemAmong the given compounds I-III, the correct order of bond dissociation energy of the C-H bond marked with an asterisk (*) is:ChemThe correct order of decreasing basic strength of the given amines is: