Green coloured complex (A) is formed when NiCl2 is dissolved in water.When “X” moles of ethane -1,2-diamine is added to 1 mole of “A” colour changes to “Z” .Identify the correct combination

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X = 2 ; Z = pale red

X = 3 ; Z = Violet

X =1 ; Z = yellow

X = 3 ; Z = colour less

answer is B.

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Detailed Solution

A=NiH2O6+2 NiH2O6+2+3en→Nien3+2+6H2O

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