To 1 mole of pyrophosphoric acid (H4P2O7) in aqueous solution 2 mole of NaOH are added. The salt formed is


Correct option is

Acidic, having two replaceable H-atom


Pyrophosphoric acid (H4P2O7) is a tetratabasic acid.



A mixture containing 0.05 mol of K2Cr2O7 and 0.02 mol of KMnO4 was treated with excess of KI in acidic medium. The liberated iodine required 2.0 L of Na2S2O3 solution for titration. Concentration of Na2S2O3solution was



Calculate the molarity of KMnO4 solution, 20 mL of which is just sufficient to oxidize 0.238 g of U4+ in acidic medium according to the reaction (atomic mass of U = 238)




50 mL of 0.04 M solution of sodium sesquicarbonate (Na2CO3.NaHCO3.2H2O) is titrated with 0.05 M HCl. V1 mL of HCl is used when phenolphthalein acts as indicator and V2 mL of HCl is used when methyl orange is the indicator in the two separate titrations. The two titration values V1and V2 differ by


0.5 g sample of oxalate salt required 30ml of 0.05 M KMnO4 in acidic medium for complete oxidation. The percent of oxalate ion in the sample is


20 mL of 0.1 M FeC2O4 solution is titration with 0.1 M KMnO4 in acidic medium. Volume of KMnO4 solution required to oxidise FeC2O4 completely is


To neutralize completely 20ml of 0.1 M phosphorous acid 40ml of KOH was required. What volume of this KOH solution will be required to neutralize 0.66 g of H3PO2?


10ml of KHC2O4 solution requires 10 ml of NaOH for complete neutralization. 10 ml of same KHC2O4 solution is oxidized by 10 ml of KMnO4 solution in acidic medium. Molarity of KMnO4 solution is


The molarity, molality and density of a solution are denoted by ω, x and yg ml–1 respectively. If molecular mass of the solute is z, then which of the following relation is correct? 


KMnO4 oxidizes Xn+ into,  itself changing to Mn2+ in acid solution. 2.68 × 10–3 mol of Xn+ require  mol of KMnO4. The value of n is


What volume of 0.01 M K2Cr2O7 would be required to oxidize Fe (II) in 50ml of 0.03 M solution of ferrous ammonium sulphate in acidic medium?