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Colour

Which of the ...

Question

Which of the ions will give colorless aqueous solution?

{N i}^{2 +}

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{F e}^{2 +}

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{C u}^{2 +}

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{C u}^{+}

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Solution

The correct option is B ${C u}^{+}$
${N i}^{2 +}$ is light green, ${F e}^{2 +}$ is pale green,

${C u}^{2 +}$ is blue and ${C u}^{1 +}$ is colorless in aqueous solution as its outermost configuration is $3 d^{10}$ so thei is no unpaired electron which causes colour.

Hence ,option D is correct.

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