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NEET levelSingle correct optionDifficulty 1 of 3df111

Which of the following ions is colourless in aqueous solution?

A $Co X^{2 +}$
B $Zn X^{2 +}$
C $Cu X^{2 +}$
D $Ni X^{2 +}$

Answer: B

Zn X^{2 +}

is

3 d^{10}

, with no vacant d orbital for a d-d transition, so it is colourless.

Ni X^{2 +}

(green),

Cu X^{2 +}

(blue) and

Co X^{2 +}

(pink) have partly filled d subshells. Answer:

Zn X^{2 +}

.

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