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What is the modification of the dual process?

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What is the modification of the dual process?

(a) Recovery of NH4Cl as co-product

(b) Recovery of NH3 as co-product

(c) Recovery of NaHCO3 as co-product

(d) Recovery of NH34(NO3) as co-product

This question was posed to me in semester exam.

My question comes from Inorganic Chemical topic in section Inorganic Chemical Industries of Chemical Technology

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The correct answer is (a) Recovery of NH4Cl as co-product

Explanation: The principal modification of the dual process is the recovery of NH4Cl as a co-product rather than the liberation of the contained ammonia for recycle as in the solvay process.

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