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Sodium chromate, Na₂CrO₄ is made commercially by :

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heating sodium dichromate with sodium carbonate

heating mixture of Cr₂O₃ and Na₂CO₃

heating mixture of chromite ore and sodium carbonate in the presence of oxygen

reacting NaOH with chromic acid

answer is B.

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Detailed Solution

Sodium chromate, Na₂CrO₄ is made commercially by heating mixture of chromite ore and sodium carbonate in the presence of oxygen.
$4 {FeCr}_{2} O_{4} + 8 {Na}_{2} {CO}_{3} + 7 O_{2} ⟶ 8 {Na}_{2} {CrO}_{4} + 2 {Fe}_{2} O_{3} + 8 {CO}_{2} ↑$

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