Q.

Sodium chromate, Na2CrO4 is made commercially by :

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a

heating sodium dichromate with sodium carbonate

b

heating mixture of Cr2O3 and Na2CO3

c

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

d

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.
4FeCr2O4+8Na2CO3+7O2⟶8Na2CrO4+2Fe2O3+8CO2↑

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Sodium chromate, Na2CrO4 is made commercially by :