Which of the following compounds after mixing can produce blue colouration

CHEMISTRY · Single correct · CBSE · Chemistry · d- and f-Block Elements · d- and f-Block Elements

Problem

Which of the following compounds after mixing can produce blue colouration? (I)

\text{K}_4[\text{Fe}(\text{CN})_6]

and

\text{FeCl}_3

solution (II)

\text{NH}_4\text{OH}

and

\text{CuSO}_4

solution (III) Adding anhydrous

\text{CuSO}_4

to water (IV)

\text{NH}_4\text{OH} + \text{NiSO}_4

solution Choose the correct code: (1) I, II, III (2) II, III (3) I, III (4) I, II, III, IV