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# Which of the following exhibits purple colour in solution?

$\begin{array}{1 1}(a)\;[Fe(H_2O)_6]^{2+}&(b)\;[Ti(H_2O)_6]^{3+}\\(c)\;[Cu(H_2O)_6]^{2+}&(d)\;[Fe(H_2O)_6]^{+3}\end{array}$

$[Ti(H_2O)_6]^{3+}$ exhibits purple colour in solution
Hence (b) is the correct answer.