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Question

Which of the following compound is paramagnetic :

A
Tetracyanonickelate(II) ion
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B
Tetraamminezinc(II) ion
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C
Hexaamine chromium(III) ion
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D
Diammine silver(I) ion
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Solution

The correct option is C Hexaamine chromium(III) ion
Hexaamine chromium(III) ion is paramagnetic.
Cr(III) has electronic configuration [Ar]3d34s0.
It contains 3 unpaired electrons. A complex is paramagnetic due to presence of unpaired electrons.

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