1.

Which reaction cannot be ussed for the preparation of the halogen acid

Answer»

`2KBr + H_2SO_4 (CONC.)RARR K_2SO_4 + 2HBr`
`NACL + H_2SO_4 (conc.) rarr NaHSO_4 + HCl`
`NaHSO_4 + NaCl rarr Na_2SO_4 + HCl`
`CaF_2 + H_2SO_4 (conc.)rarr CaSO_4 + 2HF`

ANSWER :A


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