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Cuprous ion is colourless while cupric ion is coloured because ______.

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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 one of the following sets CORRECTLY represent the increase in the paramagnetic property of the ions?
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For a transition metal ion having seven electrons in its d-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 ______.