Ammonium sulphate reacts with one mole of MnSO4 and (NH4)2S2O8 which are correct statement regarding the above reaction?(1)n factor of (NH4)2S2O8 is 1(2)moles of (NH4)2S2O8 reacted is 2(3)n factor of MnO2 is 2(4)n factor of mno2 is 1

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Here I am explaining you how to calculate n-factor
The n-factor for such salts is defined as the total moles of catioinic/anionic charge replaced in 1 mole of the salt. For the reaction,

Na₃PO₄+ BaCI₂→ NaCI + Ba₃(PO₄)₂

To get one mole of Ba₃(PO₄)², two moles of Na3PO4are required, which means six moles of Na⁺are complete replaced by 3 moles of Ba²+ions. So, six moles of cationic charge is replaced by 2 moles of Na₃PO₄, thus each mole of Na₃PO₄replaces 3 moles of cationic charge. Hence, n-factor of Na3PO4in this reaction is 3.