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

By the action of concentrated sulphuric acid

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By roasting with soda ash

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By the action of sodium hydroxide

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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.
$2 N a_{2} C r O_{4} + H_{2} S O_{4} \to N a_{2} C r_{2} O_{7} + N a_{2} S O_{4} + H_{2} O$

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