0.02M `K_2Cr_2O_7` is treated with 0.288 g of ferrous oxalate. How much volume of `K_2Cr_2O_7` is required ?

The oxidation number of Cr in K_(2)Cr_(2)O_(7) is

Reaction of aniline with K_2Cr_2O_7 gives

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?

K_2Cr_2O_7 overset(Delta)(to) ? + ? +?

K_2Cr_2O_7 is NOT used in ____________.

The oxidation state of Cr in K_(2)Cr_(2)O_(7) is: