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The d-And-f-Block Elements

Short Answer Type

61. Why do transition elements exhibit paramagnetism?

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62.

Why does Mn(II) ion show maximum paramagnetic character amongst bivalent ions of first transition series?

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63.

Calculate the magnetic moment of Fe³⁺ ion (at. no. of Fe = 26).

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64. Why Zn²⁺ salts are white while Ni²⁺ salts are blue?

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65. Why Zn²⁺ salts are white while Cu²⁺ salts are blue?

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66. [Ti(H₂O)₆]³⁺ is coloured while [Sc(H₂O)₆]³⁺ is colourless. Explain.

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67. Giving reasons indicate which one of the following would be coloured?
Cu⁺, V²⁺, Sc³⁺ Ni²⁺ (At. No., Cu = 29, V = 23, Sc = 21, Ni = 28)

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68.

Why Cd²⁺ salts are white?

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69. Cu⁺ is colourless but Cu²⁺ is coloured. Why?

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70. Which of the following do you expect to be coloured and why? Cr⁺, Cu⁺?

Transition element exhibit colour due to d-d transition. This is possible only when d- subshell have unpaired electron. Cr⁺ is coloured because of the presence of partially filled d-orbitals (3d⁵ 4s⁰) whereas Cu⁺ is colourless because of completely filled d-orbitals (3d¹⁰ 4s⁰).

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