The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

1. ${\mathrm{CoCl}}_3$
2. ${\mathrm{CoCl}}_2$
3. ${\mathrm{FeCl}}_2$
4. ${\mathrm{FeCl}}_3$

Solution

Asked in: JEE Main 2021 (01 Sep Shift 2)

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