State any four uses of `K_2Cr_2O_7`.

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 ?

8.1 g of K_2Cr_2O_7 reacts with 12.8 g of HI according to the equation Cr_2O_7^(2-)+HItoCrI_3+KI+I_2 Calculate: (a). Percentage by mass of K_2Cr_2O_7 left unreacted. (b). Volume of I_2 (g) evolved, if I_2 obtained is heated to 500 K and 1.0 atm pressure.

How many moles of K_2Cr_2O_7 required to react completely with 1 mol of H_2S in acidic medium?

The number of moles of K_(2)Cr_(2)O_(7) reduced by 1 mol of Sn^(2+) ions is

Potassium iodide reacts with acidified K_(2)Cr_(2)O_(7) . How many moles of KI are required for one mole of K_(2)Cr_(2)O_(7) ?

What happens when : (i) K_2CrO_7 reacts with acidified solution of KI (ii) SO_2 (g) is passed through a solution of K_2Cr_2O_7

A solution of Na_2S_2O_3 is standardised iodometrically by using K_2Cr_2O_7 . The equivalent weight of K_2Cr_2O_7 in this method is:

5.1 g sample of H_2O_2 solution containg x%H_2O_2 by weight requires x " mL of " K_2Cr_2O_7 solution for complete oxidation under acidic condition. What is the molarity of K_2Cr_2O_7 solution?

Equivalent weights of K_(2)Cr_(2)O_(7) in acidic medium is

Assign reasons for the following : Write equations for the preparation of K_2Cr_2O_7 from chromite ore.