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Cuprous ion is colourless while cupric ion is coloured because ______.
(a)both have half filled orbitals
(b)cuprous ion has incomplete orbital and cupric ion has completed orbitals
(c)both have unpaired electrons in orbitals
(d)cuprous ion has a completed d-orbital and cupric ion has an incomplete orbital

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Important Questions on d- and f-Block Elements
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The catalytic activity of the transition metals and their compounds is described by _____.

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Which of the following would be diamagnetic?

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Which of the following has highest paramagnetic character?

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Which one of the following sets CORRECTLY represent the increase in the paramagnetic property of the ions?

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Which of the following pair will have equal magnetic moment value?

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For a transition metal ion having seven electrons in its subshell, the magnetic moment will be ______.

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The yellow colour of chromates changes to orange on acidification due to the formation of ______.

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Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction, the oxidation number of chromium ______.
