In Which Of The Following Reaction, Oxidation Number Of N Remains Unchanged?

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

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

100ml of 0.01 M KMnO₄ oxidizes 10ml of H₂O₂ sample in acidic medium. The volume strength of H₂O₂ sample is

A sample of mixture of AO and A₂O₃ in 2 : 1 molar ratio takes 0.015 mole of K₂Cr₂O₇ to oxidize the sample completely to from  in acidic solution. Millimoles of AO and A₂O₃ in the sample are respectively

0.01 mole of Fe₃O₄ is treated with excess of KI solution in presence of dilute H₂SO₄ whereby iron is reduced to Fe²⁺ along with liberation of iodine. What volume of 0.1 M Na₂S₂O₃ will be needed to reduce the librated iodine?

KMnO₄ acts as a strong oxidizing agent in acidic medium. The reaction that occurs is

What will be the effect on the electrode potential of a half-cell represented as  if the concentration of H⁺ ion is doubled in solution?