Question

Solve this:

Q. Which reaction cannot be used for the preparation of the halogen acid–

(1) 2KBr + H₂SO₄ $\stackrel{}{\to }$ K₂SO₄ + 2HBr
​ Conc.

​ (2) NaCl + H₂SO₄ $\stackrel{}{\to }$NaHSO₄ + HCl
​ conc.

​ (3) NaHSO₄ + NaCl $\stackrel{}{\to }$Na₂SO₄ + HCl

(4) CaF₂ +H₂SO₄ $\stackrel{}{\to }$CaSO₄ + 2HF
conc.

Answer 1

Dear sudent,
Option (4) is the answer
As when it will react , HF is formed in gglass beaker or test tube, but HF reacts with glass
Regards