Question

The name of process is:
${\text{CaC}}{{\text{O}}_3}{\text{ }} \to {\text{ CaO + C}}{{\text{O}}_2}$
${\text{N}}{{\text{H}}_3}{\text{ + }}{{\text{H}}_2}{\text{O + C}}{{\text{O}}_2} \to {\text{ N}}{{\text{H}}_4}{\text{HC}}{{\text{O}}_3}$
${\text{NaCl + N}}{{\text{H}}_4}{\text{HC}}{{\text{O}}_3} \to {\text{ N}}{{\text{H}}_4}{\text{Cl + NaHC}}{{\text{O}}_3}$
${\text{2N}}{{\text{H}}_4}{\text{Cl + CaO}} \to {\text{ CaC}}{{\text{l}}_2}{\text{ + 2N}}{{\text{H}}_3}{\text{ + }}{{\text{H}}_2}{\text{O}}$
A. Solvay
B. lowing
C. salt cake
D. gossage

Answer 1

The given reactions are the step by step reactions which are used for the production of a particular compound. It starts with calcium carbonate and ends with the production of calcium chloride. For answering this question we must have knowledge of processes which are mentioned in options.

Complete answer:
The reactions which are mentioned over there are a part of the Solvay process. Solvay process is also known as ammonia-soda process. It is the major for production of sodium carbonate at large scale in industry. During this process carbon dioxide gas is passed through the brine solution. A brine solution is an aqueous solution of sodium chloride. This solution is saturated with the ammonia to form sodium bicarbonate. Then we get the precipitate of sodium bicarbonate. This precipitate is now filtered, dried and then gets ignited to form sodium bicarbonate. This can be represented as, ${\text{2NaHC}}{{\text{O}}_3}{\text{ }}\xrightarrow{\Delta }{\text{ N}}{{\text{a}}_2}{\text{C}}{{\text{O}}_3}{\text{ + C}}{{\text{O}}_2}{\text{ + }}{{\text{H}}_2}{\text{O}}$
This reaction is also known as calcination reaction. Here the by-products are water and carbon dioxide. The carbon dioxide here produced can be used in previous steps. The only reactants to this process is limestone and thermal energy which is given in the form of heat. At the end of the reaction, the major by-product is calcium chloride which is also known as road salt.
And hence the correct answer is option A.

Note:
In addition to the ancient Solvay process, there is a new modern Solvay process. The major change in the modern Solvay process is that salt which is produced at the end of the process is ammonium chloride. Earlier it was calcium chloride. Steps of the process must be in the sequence for production of sodium carbonate.