(A) This reaction sequence represents the Solvay process for the manufacture of sodium carbonate.Step $1$: $CO_2 + NH_3 + H_2O \to NH_4HCO_3$ $(X)$Ste

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(A) This reaction sequence represents the Solvay process for the manufacture of sodium carbonate.Step $1$: $CO_2 + NH_3 + H_2O \to NH_4HCO_3$ $(X)$Step $2$: $NH_4HCO_3 + NaCl \to NaHCO_3$ $(Y)$ $+ NH_4Cl$Step $3$: $2NaHCO_3 \xrightarrow{\Delta} Na_2CO_3$ $(Z)$ $+ H_2O + CO_2$Thus,'$Z$' is $Na_2CO_3$.