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Which raw material used for the production of urea?

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Which raw material used for the production of urea?

(a) CO2+N2

(b) CO2+NH3

(c) NH2CONH2

(d) NH3

This question was addressed to me during an interview.

This interesting question is from Inorganic Chemical topic in section Inorganic Chemical Industries of Chemical Technology

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The correct choice is (b) CO2+NH3

To explain: The principal raw materials required for the production of urea are CO2 from synthesis gas manufacture and NH3 in an amount of 1.15 ton and 1.47 ton respectively for once- through process.

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