Of The Ions Zn2+, Ni2+ and Cr3+, (atomic Number Of Zn = 30, Ni = 28, Cr = 24)

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Question

 

Of the ions Zn2+, Ni2+ and Cr3+,

(atomic number of Zn = 30, Ni = 28, Cr = 24)

Solution

Correct option is

Only Zn2+ is colourless and Ni2+ and Cr3+ are coloured

Ni2+ and Cr2+ are coloured due to presence of unpaired elecrrons. But Zn2+ is colourless because of absence of unpaired electrons.

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