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Question

How is sodium chromate converted into sodium dichromate in the manufacture of potassium dichromate from chromite ore?


A
By the action of concentrated sulphuric acid
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B
By roasting with soda ash
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C
By the action of sodium hydroxide
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D
By the action of lime stone
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Solution

The correct option is A By the action of concentrated sulphuric acid
In the manufacture of potassium dichromate from chromite ore, sodium chromate is converted into sodium dichromate by the action of concentrated sulphuric acid.
$$\displaystyle 2Na_2CrO_4 + H_2SO_4 \rightarrow Na_2Cr_2O_7 + Na_2SO_4 + H_2O$$

Chemistry

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