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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3qc106

Select the correct statements about nickel and cobalt.

AIn $Ni (DMG) X_{2}$ the two ligands are held in a plane with two intramolecular O--H $\dots$ O hydrogen bonds
B $Ni (DMG) X_{2}$ is paramagnetic with two unpaired electrons
C $K X_{3} [Co (NO X_{2}) X_{6}]$ contains cobalt in the $+ 3$ state
D $[Co (NCS) X_{4}] X^{2 -}$ is tetrahedral

Answer: A, C, D

The planar red chelate has the bridging hydrogen bonds, the blue thiocyanate complex of Co(II) is tetrahedral, and the yellow nitrite salt contains Co(III).

Ni (DMG) X_{2}

is square planar and diamagnetic, so the last statement is false.

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