In an aqueous solution of $N i C l_{2}$ , if the bidentate ligand ethylene - 1, 2 - diamine (en) is added progressively in molar ratios such as Ni ∶ en - 1 ∶ 1, 1 ∶ 2, 1 ∶ 3 then three octahedron complexes x, y and z are formed respectively. Select the correct statement(s) about x, y and z.

Complex x has the maximum value of absorbed wavelength

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Complex y is coloured

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Complex z has the maximum number of chelate rings

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All three are paramagnetic outer orbital complexes

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Solution

The correct options are
A Complex x has the maximum value of absorbed wavelength
B Complex y is coloured
C Complex z has the maximum number of chelate rings
D All three are paramagnetic outer orbital complexes
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