Question

# Which reaction cannot be used for the preparation of the halogen acid?

A
2KBr+H2SO4(Conc)K2SO4+2HBr
B
NaCl+H2SO4(Conc)NaHSO4+HCl
C
NaHSO4+NaCl(Conc)Na2SO4+HCl
D
CaF2+H2SO4(Conc)CaSO4+2HF

Solution

## The correct option is A $$2KBr+{ H }_{ 2 }{ SO }_{ 4 } (Conc)\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+2HBr$$HBr can be synthesized by a variety of methods. It may be prepared in the laboratory by distillation of a solution of sodium bromide or potassium bromide with phosphoric acid or sulfuric acid:$$KBr + H_2SO_4 → K_2SO_4 + HBr$$Chemistry

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