Which reagent can be used to identify nickel ion

1.	Which reagent can be used to identify nickel ion
A.	Resorcinol
B.	Dimethyl glyoxime [DMG]
C.	Diphenyl benzidine
D.	Potassium ferrocyanide
Answer» C. Diphenyl benzidine

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Which reagent can be used to identify nickel ion

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