The colour of hexaaquacobalt(II) ion, [Co(H2O)6]^2+, in aqueous solution is:

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The colour of hexaaquacobalt(II) ion, $[Co (H X_{2} O) X_{6}] X^{2 +}$ , in aqueous solution is:

[Co (H X_{2} O) X_{6}] X^{2 +}

3 d^{7}

and octahedral. It absorbs in the blue-green region and appears pink.