Write the chemical equation for the laboratory preparation of HCl gas when the reactants are above $200 ° C$

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Solution

When Concentrated Sulphuric acid is added to Sodium Chloride at the temperatures of $200 ° C$ , then Sodium bisulphate is formed as shown below:
$NaCl (s) + H_{2} {SO}_{4} (aq) \overset{Below 200^{0} C}{\to} {NaHSO}_{4} (s) + HCl (g) ↑ Sodium Sulphuric Sodium Chloride acid bisulphate$
But when the temperature is raised above $200 ° C$ , then this Sodium bisulphate will further react to give Sodium Sulphate and liberate Hydrogen Chloride.
$2 NaCl (s) + H_{2} {SO}_{4} (aq) \overset{Above 200^{0} C}{\to} {Na}_{2} {SO}_{4} (s) + 2 HCl (g) ↑ Sodium Sulphuric Sodium Chloride acid bisulphate$

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Write the chemical equation for the laboratory preparation of HCl gas when the reactants are above 200°C

Write the chemical equation for the laboratory preparation of HCl gas when the reactants are above $200 ° C$