A `0.518 g` sample of limestone is dissolved in `HCl` and then the calcium is precipitated as `CaC_(2)O_(4)`. After filtering and washing the precipitate, it requires `40.0` filtering and washing the precipitate, it requires `40.0 mL` of `0.250 N KMnO_(4)`, solution acidified with `H_(2)SO_(4)` to titrate it as. The percentage fo `CaO` in the sample is:
`MnO_(4)^(-)+H^(+)+C_(2)O_(4)^(2-)rarrMn^(2+)+CO_(2)+2H_(2)O`

A 0.518 g sample of lime stone is dissolved in HCl and then the calcium is precipitated as CaC_2O_4 After filtering and washing the precipitate, it requires 40.0 mL of 0.250 N KMnO_4 solution acidified with H_2SO_4 to titrate it as, MnO_(4)^(-)+H^(+) +C_(2)O_(4)^(2-) rarr Mn^(2+)+CO_(2)+2H_(2)O The percentage of CaO in the sample is:

A 0.56 g sample of limestones is dissolved in acid and the calcium is precipitated as calcium oxalate .The precipitate as calcium oxalate the prepcipate is filtered washed with water and dissolved in dil H_(2)SO_(4) The solution required 40ml of 0.25NKmnO_(4) solutions for titration .Calculate percentage of 0.25N KMnO_(4) solution for titration .Calculate of 0.25N KMnO_(4) solution for titration ,Calculate percentage of CaO in limestone sample.

0.7 g sample of iron ore was dissolved in acid. Iron was reduced to +2 state and it required 50 " mL of " (M)/(50) KMnO_(4) solution for titration. The percentage of Fe and Fe_(3)O_(4) in the ore is

0.7 g sample of iron ore was dissolved in acid. Iron was reduced to +2 state and it required 50 " mL of " (M)/(50) KMnO_(4) solution for titration. The percentage of Fe and Fe_(3)O_(4) in the ore is

Aqueous solutions of Na_(2)C_(2)O_(4) and CaCI_(2) are mixed and precipitate of CaC_(2)O_(4) formed is filered and dried. 250 mL of the saturated solution of CaC_(2)O_(4) required 6.0 mL of 0.001M KMnO_(4) solution in acidic medium for complete titration. K_(sp) of CaC_(2)O_(4) is

Aqueous solutions of Na_(2)C_(2)O_(4) and CaCI_(2) are mixed and precipitate of CaC_(2)O_(4) formed is filered and dried. 250 mL of the saturated solution of CaC_(2)O_(4) required 6.0 mL of 0.001M KMnO_(4) solution in acidic medium for complete titration. K_(sp) of CaC_(2)O_(4) is

0.2 g if a sample of H_2 O_2 required 10 ml of 1 N KMnO_4 for titration in acidic medium. The percentage purity of H_2 O_2 sample is:

0.2 g if a sample of H_2 O_2 required 10 ml of 1 N KMnO_4 for titration in acidic medium. The percentage purity of H_2 O_2 sample is: