Two litre of FeSO4 solution is added to a container containing 1.2 litre of 0.4 M acidified KMnO4 solution. After decolourisation of pink colour, the remaining solution required 400 mL of 4 N acidified K₂Cr₂O7 solution to change the colourless solution to just green. How many moles of Fe²+ ions was present in the FeSO4 solution?
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