Write the chemical equations for the laboratory preparation of $HCl$ gas when then reactants are:
(A) below $200^{°} C$
(B) above $200^{°} C$

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Solution

For the production of Hydrogen chloride gas $(HCl)$ , Sodium chloride $(NaCl)$ and Sulphuric acid $(H_{2} {SO}_{4})$ are main reactants.
(A)The chemical equation when the reactants are below $200^{°} C$ .
$\underset{Sodium chloride}{\underset{⏟}{NaCl (s)}} + \underset{Sulphuric acid}{\underset{⏟}{H_{2} {SO}_{4} (aq .)}} \overset{< 200^{°} C}{\to} \underset{Sodium hydrogen sulphate}{\underset{⏟}{{NaHSO}_{4} (s)}} + \underset{Hydrochloric acid}{\underset{⏟}{HCl (g)}}$
Here, in this reaction $NaCl and H_{2} {SO}_{4}$ are reacting with each other and producing ${NaHSO}_{4} and HCl$ as the product.
(B)The chemical equation when the reactants are above $200^{°} C$ .
$\underset{Sodium chloride}{\underset{⏟}{2 NaCl} (s)} + \underset{Sulphuric acid}{\underset{⏟}{H_{2} {SO}_{4} (aq .)}} \to \underset{Sodium sulphate}{\underset{⏟}{{Na}_{2} {SO}_{4} (s)}} + \underset{Hydrochloric acid}{\underset{⏟}{2 HCl (g)}}$
Here, in the reaction when $NaCl and H_{2} {SO}_{4}$ are reacting with each other then it will produce ${Na}_{2} {SO}_{4}$ and $HCl$ as the product.

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Write the chemical equations for the laboratory preparation of HCl gas when then reactants are: (A) below 200°C (B) above 200°C

Write the chemical equations for the laboratory preparation of $HCl$ gas when then reactants are:
(A) below $200^{°} C$
(B) above $200^{°} C$