Why Zn2+ salts are white while Ni2+ salts are blue? fro
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    The d-And-f-Block Elements

    Multiple Choice QuestionsShort 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?

    Zn2+ has completely filled d-orbitals (3d10) while Ni2+ has incompletely filled d-orbitals (3d8). thus d-d transition take place and nickel show blue color.
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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+?
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