`20 mL` of a solution containing `0.2g` of impure sample of `H_(2)O_(2)` reacts with

A 20.0 mL solution containing 0.2 impure H_2O_2 reacts completely with 0.316 g of KMnO_4 in acid solution . The purity of H_2O_2 (in%) is ...........(mol .wt.of H_2O_2=34 , mol . Wt . Of KMnO_4 = 158 )

10 mL of a given solution of H_(2)O_(2) contains 0.91 g of H_(2)O_(2) . Express its strength in volume.

In a given sample of H_(2)O_(2) each 100 mL of solution contains 68 mg of H_(2)O_(2) . The molarity of the solution is

Calculate the normality of solution containing 31.5 g of hydrated oxalic acid (H_(2)C_(2)O_(4).2H_(2)O) in 1250 mL of solution.

Calculate the normality of solution containing 31.5 g of hydrated oxalic acid (H_(2)C_(2)O_(4),2H_(2)O) in 1250 mL of solution.

12. g of an impure sample of arsenious oxide was dissolved in water containing 7.5 g of sodium bicarbonate and the resulting solution was diluted to 250 mL . 25 mL of this solution was completely oxidised by 22.4 mL of a solution of iodine. 25 mL of this iodine solution reacted with same volume of a solution containing 24.8 g of sodium thiosulphate (Na_(2)S_(2)O_(3).5H_(2)O) in one litre. Calculate teh percentage of arsenious oxide in the sample ( Atomic mass of As=57 )