The spin only magnetic moment of Mn4+ ion is nearly from Chemist

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 Multiple Choice QuestionsMultiple Choice Questions

151.

A transition metal ion exists in its highest oxidation state. It is expected to behave as :

  • a chelating agent

  • a central metal in a coordination compound

  • an oxidising agent

  • a reducing agent


152.

The highest magneticmoment is shown by the transition metal ion with the configuration :

  • 3d2

  • 3d5

  • 3d7

  • 3d9


153.

In the periodic table metals usually used as catalysts belong to

  • f-block

  • d-block

  • p-block

  • s-block


154.

Which of the following forms a colourless solution in aqueous medium?

  • Cr3+

  • C3+

  • Sc3+

  • Ti3+


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155.

Which of the following has the maximum number of unpaired 'd' electrons?

  • Zn2+

  • Fe2+

  • Ni3+

  • Cu+


156.

An element with atomic number 21 is a

  • halogen

  • representative element

  • transition element

  • alkali metal


157.

Mercury is a liquid metal because

  • it has a completely filled s orbital

  • it has a small atomic size

  • it has a completely filled d orbital that prevents d-d overlapping of orbitals

  • it has a completely filled d orbital that causes d-d overlapping


158.

In chromite ore, the oxidation number of iron, and chromium are respectively

  • +3,+2

  • +3,+6

  • +2,+6

  • +2,+3


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159.

In chromite ore, the oxidation number of iron and chromium are respectively

  • +3, +2

  • +3, +6

  • +2, +6

  • +2, +3


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160.

The spin only magnetic moment of Mn4+ ion is nearly

  • 3BM

  • 6BM

  • 4BM

  • 5BM


C.

4BM

The electronic configuration of Mn is

25Mn = [Ar] 3d5 4s2

Mn4+ = [Ar] 3d3

Thus, three unpaired electrons are present.

Spin only magnetic moment, µ=√n(n+2)

                  n = 3

                  µ =√3(3+2)

                  µ =√15 = 3.87

                  µ = 4 BM


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