A mixture of `FeO and Fe_2 O_3` is completely reacted with `100mL` of `0.25M` acidified `KMnO_4` solution. The resulting solution was then treated with Zn dust which converted `Fe^(3+)` of the solution to `fe^(2+)`. The `Fe^(2=)` required `100mL` of `0.10MK_2 Cr_2O_7` solution. Find out the weight `% Fe_2O_3` in the mixture.

Describe the reaction of acidified K_2Cr_2O_7 with Na_2SO_3 solution.

Haematite is Fe_2O_3 / Fe_3O_4 .

4 mole of a mixture of Mohr's salt and Fe_2(SO_4)_3 requires 500mL of 1 M K_2Cr_2O_7 for complete oxidation in acidic medium. The mole % of the Mohr's salt in the mixture is :

20mL of H_(2)O_(2) solution is reacted with 80 mL of 0.05 M KMnO_(4) "in acidic medium then what is the volume strength of" H_(2)O_(2) ?

Calculate oxidation number of Fe in Fe2O3.

Calculate oxidation number of Fe in Fe2O3.

Out of Fe^(2+) and Fe^(3+) which is more paramagnetic and why ?

0.80g is impure (NH_4)SO_4) was boiled with 100mL of 0.2N NaOH solution till all the NH_3 (g) evolved. The remaining solution was diluted to 250mL. 25mL of this solution was neutralized using 5mL of 0.2 NH_2 SO_4 solution. The percentage purity of the (NH_4)_2SO_4 sample is :

A mixture of H_(2)SO_(4) and H_(2)C_(2)O_(4) (oxalic acid ) and some inert impurity weighing 3.185 g was dessolved in water and the solution made up to 1litre. 10 mL of this solution required 3 mL of 0.1 N NaOH for complete neutralization. In another experiment 100 mL of the same solution in hot condition required 4 mL of 0.02 M KMnO_(4) solution for complete reaction. The mass % of H_(2)SO_(4) in the mixture was:

Complete the following reaction : Fe_2O_3 + Al rarr