32g of a sample of `FeSO_(4) .7H_(2)O` were dissolved in dilute sulphuric aid and water and its volue was made up to 1litre. 25mL of this solution required 20mL of `0.02 M KMnO_(4)` solution for complete oxidation. Calculate the mass% of `FeSO_(4) .7 H_(2)O` in the sample.

25 g of a sample of FeSO_(4) was dissolved in water containing dil. H_(2)SO_(4) and the volume made upto 1 litre. 25 mL of this solution required 20mL of N/ 10 KMnO_(4) for complete oxidation. Calculate % of FeSO_(4).7H_(2)O in given sample.

25.0 g of FeSO_(4).7H_(2)O was dissolved in water containing dilute H_(2)SO_(4) and the volume was made up to 1.0 L. 25.0 " mL of " this solution requried 20 " mL of " an (N)/(10) KMnO_(4) solution for complete oxidation the percentage of FeSO_(4)7H_(2)O in the acid solution is

0.2828 g of iron wire was dissolved in excess dilute H_(2)SO_(4) and the solution was made upto 100mL. 20mL of this solution required 30mL of N/(30)K_(2)Cr_(2)O_(7) solution for exact oxidation. Calculate percent purity of Fe in wire.

A sample of 28 mL of H_(2) O_(2) (aq) solution required 10 mL of 0.1 M KMnO_(4) (aq) solution for complete reaction in acidic medium. What is the valume strength of H_(2)O_(2) ?

1.5 g of chalk was treated with 10 " mL of " 4 N HCl. The chalk was dissolved and the solution was made to 100 mL. 25 " mL of " this solution required 18.75 " mL of " 0.2 N NaOH solution for comjplete neutralisation. Calculate the percentage of pure CaCO_3 in the sample of chalk.

A mixture of H_(2)C_(2)O_(4) and NaHC_(2)O_(4) weighing 2.02 g was dissolved in water and the solution made uptp one litre. 10 mL of this solution required 3.0 mL of 0.1 N NaOH solution for complete neutralization. In another experiment 10 mL of same solution in hot dilute H_(2)SO_(4) medium required 4 mL of 0.1N KMnO_(4) KMnO_(4) for compltete neutralization. Calculate the amount of H_(2)C_(2)O_(4) and NaHC_(2)O_(4) in mixture.

A mixture of H_(2)C_(2)O_(4) and NaHC_(2)O_(4) weighing 2.02 g was dissolved in water and the solution made upto one litre. 10 mL of this solution required 3.0 mL of 0.1 N NaOH solution for complete neutralization. In another experiment 10 mL of same solution in hot dilute H_(2)SO_(4) medium required 4 mL of 0.1N KMnO_(4) for complete neutralization. Calculate the amount of H_(2)C_(2)O_(4) and NaHC_(2)O_(4) in mixture.

A 0.46 g sample of As_(2)O_(3) required 25.0 " mL of " KMnO_(4) solution for its titration. The molarity of KMnO_(4) solution is

5g sample contain only Na_2CO_3 and Na_2SO_4 . This sample is dissolved and the volume made up to 250mL. 25mL of this solution neutralizes 20mL of 0.1M H_2SO_4 . Calculate the percent of Na_2SO_4 in the sample.

A solution of H_(2)O_(2) labelled as '20 V' was left open. Due to this some, H_(2)O_(2) decomposed and volume strength of the solution decreased . To determine the new volume strength of the H_(2)O_(2) solution, 10 mL of the solution was taken and it was diluted to 100 mL . 10 mL of this diluted solution was titrated against 25 mL of 0.0245 M KMnO_(4) solution under acidic condition. Calculate the volume strength of the H_(2)O_(2) solution .