Sodium carbonate is prepared by Solvay process. Which of the following compounds is obtained as a by-product?

Step-by-step solution

Here C a C l 2 is formed as a by-product N H 3 + H 2 O + C O 2 → N H 4 H C O 3 …(i) N a + + C l - + N H 4 + + H C O 3 - → N a H C O 3 ( p p t . ) + N H 4 + + C l - …(ii) For step (i), C O 2 is produced by heating limestone. C a C O 3 → C a O + C O 2 CaO so-obtained is slaked with H 2 O and N H 4 C l produced in step (ii) reacts to form C a C l 2 as a by-product. CaO   +   H 2 O → Ca(OH) 2 → NH 4 Cl CaCl 2   +   2NH 3   +   2H 2 O