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When chromite ore FeCr(2)O(4) is fuse wi...

When chromite ore `FeCr_(2)O_(4)` is fuse with NaOH in presence of air, a yellow coloured compound (A) is obtained which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C).
(i) Write the formula of the compounds (A),(B) and (C).
(ii) Write one use of compounds (C).

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(i) The compound (C) is `K_(2)Cr_(2)O_(7)`. For its preparation from `FeCr_(2)O_(4)`
(ii) It acts as a powerful oxidising agent.
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