Question

Which of the following reactions are used for the preparation of the halogen acid?

• A. $2KBr+\underset{conc.}{H_{2}S{O}_4}⟶K_{2}S{O}_4+2HBr$
• B. $Ca{F}_2+\underset{conc.}{H_{2}S{O}_4}⟶CaS{O}_4+2HF$
• C. $NaCl+\underset{conc.}{H_{2}S{O}_4}⟶NaHS{O}_4+HCl$
• D. $2KI+\underset{conc.}{H_{2}S{O}_4}⟶K_{2}S{O}_4+2HI$

Answer 1

Answer: (B), (C)

$NaCl+\underset{conc.}{H_{2}S{O}_4}⟶NaHS{O}_4+HCl$

For synthesizing $HCl$:

$NaCl+\underset{conc.}{H_{2}S{O}_4}⟶NaHS{O}_4+HCl$

And for preparing $HF$,

$Ca{F}_2+\underset{conc.}{H_{2}S{O}_4}⟶CaS{O}_4+2HF$