The concentration of `Fe^(2+)` (10ml) required to oxidize 15ml of 0.1M `K_2Cr_2O_7` solution is:

Volume of 0.1 M K_2Cr_2O_7 required to oxidize 35 ml of 0.5 M FeSO_4 solution is

A mixture of FeO and Fe_(2)O_(3) is reacted with acidified KMnO_(4) solution having a concentration of 0.2278 M, 100 ml of which was used. The solution was then titrated with Zn dust which converted Fe_(2+) of the solution to Fe^(2+) . The Fe^ (2+) required 1000 ml of 0.13 M K_(2)Cr_(2) O_(7) solution. Find the % of FeO & Fe_(2)O_(3) .

A mixture of FeO and Fe_(2)O_(3) is completely reacted with 100 mL of 0.25 M acidified KMnO_(4) solution. The resultant solution was then treated with Zn dust which converted Fe^(3+) of the solution to Fe^(2+) .The Fe^(2+) required 1000 mL of 0.10 MK_(2)Cr_(2)O_(7) solution. Find out the weight % Fe_(2)O_(3) in the mixture.

Volume of 0.1M K_(2)Cr_(2)O_(7) required to oxidise 35 mL of 0.5M FeSO_(4) solution is

Volume of 0.1 M K_(2)Cr_(2)O_(7) required to oxidize 35 mL of 0.5 M FeSO_(4) solution is

Volume of 0.1M KMnO_(4) solution required to oxidise 20ml of 0.5M of H_(2)O_(2) solution in presence of H_(2)SO_(4) is? (A) 80ml, (B)40ml (C)20ml (D) 10ml