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Which of the following transition metal ions are colourless?

$(a)\;Ti^{2+}\qquad(b)\;Cu^{+2}\qquad(c)\;Ni^{+2}\qquad(d)\;Zn^{+2}$

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Answer: Zn$^{+2}$
Since Zn$^{+2}$ is a 3d$^{10}$ ion, it does not absorb visible light even though the d-orbitals are correct for absorbing visible wavelengths. Hence it's colourless.
answered Jan 29, 2014 by sreemathi.v
edited Jul 31, 2014 by balaji.thirumalai
 

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