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प्रश्न
How is sodium chromate converted into sodium dichromate in the manufacture of pqtassium dichromate from chromite ore?
विकल्प
By the action of concentrated sulphuric acid
By roasting with soda ash
By the action of sodium hydroxide
By the action oflimestone
MCQ
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उत्तर
By the action of concentrated sulphuric acid.
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