Indicate the steps in the preparation of:
(i). `K_2Cr_2O_7` from chromite ore.
(ii). `KMnO_4` from pyrolusite ore

(a) Indicate the steps in the preparation of K_2Cr_2O_7 from chromite ore. (b) Complete the reaction: K_2Cr_2O_7 overset(Delta)(to)

preparation of K2Cr2O7 and related structure

Give the preparation of potassium permanganate from pyrolusite ore.

(i) Why do transition metals form a large number of alloys? (ii) Write the steps with chemical reactions involved in the preparation of K_2Cr_2O_7 from chromite ore.

The important step in the extraction of metal from carbonate ore is

Give reasons for the following: (a) Transition metals and many of their compounds act as catalysts. (b) Scandium (Z = 21) does not exhibit variable oxidation state and yet it is regarded as a transition element. (c) Write the step involved in the preparation of Na_2CrO_4 from chromite ore.

Explain the method of preparation of sodium dichromate from chromite ore . Give the equation representing oxidation of ferrous salts by dichromate ion.

The metal which can be extracted from pyrolusite ore is: