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Which one is dual process?

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Which one is dual process?

(a) Na2CO3+NH4Cl

(b) Na2CO3+NaCl

(c) NH4Cl+Ca(OH)^2

(d) CaCO3+NaCl

I have been asked this question in a national level competition.

The doubt is from Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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The correct choice is (a) Na2CO3+NH4Cl

The explanation: Ammonium chloride and calcium hydroxides reacts in solvay process along with calcium carbonate and sodium chloride while sodium carbonate and ammonium chloride reacts in dual process.

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