10 mL of `Fe^(2+)` ion react completely with 20 mL of 0.02 molar acidified `K_2Cr_2O_7` solution. Find the molarity of `Fe^(2+)` ion.

15 mL of aqueous solution of Fe^(2+) in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr_(2) O_(7)^(2-) . The molarity of the Fe^(2+) solution is "__________" xx 10^(-2) M . ( Round off to the Nearest Integer ).

20 " mL of " H_(2)O_(2) is reacted completely with acidified K_(2)Cr_(2)O_(7) solution 40 " mL of " K_(2)Cr_(3)O_(7) solution was required to oxidised the H_(2)O_(2) completely. Also, 2.0 " mL of " the same K_(2)Cr_(2)O_(7) solution required 5.0 " mL of " a 1.0 M H_(2)C_(2)O_(4) solution to reach equivalence point. Which of the following statements is/are correct?

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.

50mL aqueous solution of Fe_(2)SO_(4) was neutralized with 100mL of 0.2 M KMnO_(4) and 200ml of 1 M H_(2)SO_(4) solution. Find the molarity of FeSO_(4) solution.

20 ml of 0.02 M KMnO_(4) was required to completely oxidise 10 ml of oxalic acid solution. What is the molarity of the oxalic acid solution ?

20mL of H_2O_2 is reacted completely with acidified K_2Cr_2O_7 solution. 40mL of K_2Cr_2O_7 solution is required to oxidise the H_2O_2 completely. Also, 2.0mL of the same K_2Cr_2O_7 solution is required to oxidise 5.0mL of a 1.0MH_2C_2O_4 solution to reach equivalence point. Which of the following statements is // are correct?