Which of the following compound is paramagnetic :

Tetracyanonickelate(II) ion

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Tetraamminezinc(II) ion

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Hexaamine chromium(III) ion

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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 $[A r] 3 d^{3} 4 s^{0}$ .
It contains 3 unpaired electrons. A complex is paramagnetic due to presence of unpaired electrons.

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