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Which of the following statements in most likely to be incorrect

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$Ti {({NO}_{3})}_{4}$ is a colourless compound

${[Cu {(NC . {CH}_{3})}_{4}]}^{+} {BF}_{4}^{-}$ is a colourless compound

${[Cr {({NH}_{3})}_{6}]}^{3 +} 3 {Cl}^{-}$ is a coloured compound

$K_{3} [{VF}_{6}]$ is a colourless compound

answer is D.

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Detailed Solution

Complex species in which the metal has unpaired electrons are mostly coloured, but the converse may not be true LnK₃[VF₆], the central metal atom has two unpaired electrons. So it is mostly coloured. $(V^{3 +} : t_{2 g}^{2} {eg}^{0})$

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