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JEE Main levelSingle correct optionDifficulty 2 of 3df134

Which of the following solids is white (colourless)?

A $CoCl X_{2} \cdot 6 H X_{2} O$
B $CuSO X_{4} \cdot 5 H X_{2} O$
C $NiSO X_{4} \cdot 7 H X_{2} O$
D $CuCl$

Answer: D

Copper(I) is

3 d^{10}

, so

CuCl

cannot show d-d transitions and is white. The others contain

Cu X^{2 +}

(

d^{9}

, blue),

Ni X^{2 +}

(

d^{8}

, green) and

Co X^{2 +}

(

d^{7}

, red-pink).

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