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Select the coloured compound(s):

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$K_{2} {Cr}_{2} O_{7}$

${CuSO}_{4} \cdot 5 H_{2} O$

$[Cu {({NH}_{3})}_{4}] {SO}_{4}$

$[V {(H_{2} O)}_{6}] {Cl}_{3}$

answer is A, B, C, D.

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Detailed Solution

An important molecule employed as an oxidant in numerous processes is potassium dichromate ( $K_{2} {Cr}_{2} O_{7}$ ), an orange-colored crystal.

The pentahydrate of copper (2+) sulphate ${CuSO}_{4} \cdot 5 H_{2} O$ is copper (II) sulphate. a solid crystal that is vivid blue.

Tetrammine copper (II) sulphate $[Cu {({NH}_{3})}_{4}] {SO}_{4}$ is blue in colour.

Therefore, all the options are correct.

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