Q 2686678577.     (a) What may be the possible oxidation state of the transition metals with the following d electronic configurations in the ground state of their atoms:

`3d^3 4s^2, 3d^5 4s^2` and `3d^6 4s^2`. Indicate relative stability of oxidation states in each case.

(b) Write steps involved in the preparation of (i) `Na_2CrO_4` from chromite ore and (ii) `K_2MnO_4` from pyrolusite ore.

CBSE-12th 2008

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