Which of the following ions will give colourless 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 D $C u^{+}$
In aqueous solution :
${N i}^{2 +}$ is light green in color
${F e}^{2 +}$ is pale green in color
${C u}^{2 +}$ is blue in color
${C u}^{+}$ is an unstable state of copper and is colorless.

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