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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 formed an orange colured 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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To solve the problem step by step, we will identify the compounds formed in the reactions involving chromite ore and their subsequent transformations. ### Step 1: Reaction of Chromite Ore with NaOH in Presence of Air When chromite ore \( \text{FeCr}_2\text{O}_4 \) is fused with sodium hydroxide (NaOH) in the presence of air (which provides oxygen), a yellow colored compound is formed. The reaction can be represented as follows: \[ \text{FeCr}_2\text{O}_4 + 4 \text{NaOH} + 3 \text{O}_2 \rightarrow 2 \text{Na}_2\text{CrO}_4 + \text{Fe}_2\text{O}_3 + 4 \text{H}_2\text{O} \] ...
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