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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).

Text Solution

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`A = Na_(2) CrO_(4)` (Sodium Chromate) Yellow coloured
`B = Na_(2) Cr_(2) O_(7)` (Sodium dichromate)
`C = K_(2) Cr_(2) O_(7)` (Potassium dichromate) (orange crystal)
Use of potassium dichromate : It is used as a primary standard for the estimation of `Fe^(2+)` and `I^(-)` ions in redox titration.
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