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Question
Which among the following sets of compounds is used as raw material for the preparation of sodium carbonate by Solvay process?
Options
NaOH, HCl, CO2
NH4Cl, H2O, NaCl
NaCl, NH3, Ca(OH)2
NaCl, CaCO3, H2SO4
MCQ
Solution
NaCl, NH3, Ca(OH)2
Explanation:
For the preparation of sodium carbonate by Solvay process, raw materials used are NaCl, NH3 and Ca(OH)2 (for CO2).
The process involves the following reactions.
\[\ce{NH3 + H2O + CO2 -> NH4NO3}\]
\[\ce{CaCO3 ->[\Delta] CaO + CO2}\]
\[\ce{NaCl + NH4HCO3 -> NaHCO3 + NH4Cl}\]
\[\ce{CaO + H2O -> Ca(OH)2}\]
\[\ce{2NH4Cl + Ca(OH)2 -> CaCl2 + 2NH3 + 2H2O}\]
\[\ce{2NaHCO3 ->[\Delta] Na2CO3 + H2O + CO2}\]
Most of the NH3 can be recovered in the process.
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