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NEET Chemistry · d- and f-Block Elements

Oxidation states, colour, magnetism and catalytic behaviour

Taught in NCERT Class 12 Chemistry, Chapter 4: The d- and f-Block Elements.

2 verified questions: Easy 0 · Medium 2 · NEET level 0

Sample questions

Sample 1Medium

An orbital box diagram for a gaseous dipositive ion of the element with atomic number 25 shows five 3d boxes each holding one electron, all with parallel spins, and an empty 4s box. What is the spin-only magnetic moment of this ion?

  1. A

    5.92 BM

  2. B

    4.90 BM

  3. C

    3.87 BM

  4. D

    1.73 BM

Show the answer
The answer is A.

The ion is Mn²⁺ (3d⁵) with n = 5 unpaired electrons. μ = √[n(n + 2)] = √35 = 5.92 BM.

  • B.

    4.90 BM corresponds to four unpaired electrons, √(4 × 6).

  • C.

    3.87 BM corresponds to three unpaired electrons, √(3 × 5).

  • D.

    1.73 BM corresponds to one unpaired electron, √(1 × 3).

NCERT: Class 12 Chemistry, Chapter 4

Practise Oxidation states, colour, magnetism and catalytic behaviour

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