VITEEE 2013 Paper

I. Fe2+ = Ar , 3d6 :

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4 unpaired electrons,
∴ Coloured ion,
II. Ni2+ = Ar , 3d8 :

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2 unpaired electrons,
∴ Coloured ion
II. Al3+ = [Ne]
No Lin paired electron in 3d, colourless ion