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Q.

When chromite ore is heated with Na2CO3 powder in the presence of air

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a

One gaseous product is formed

b

one product is water insoluble which is dark brown in colour

c

one product is water soluble which is red in colour

d

one product is water soluble which is yellow in color

answer is A.

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Detailed Solution

FeCr2O4+Na2CO3→ΔO2Na2CrO4YellowSolinH2O+Fe2O3(Brown)+CO2↑
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When chromite ore is heated with Na2CO3 powder in the presence of air