Which amongst the following reactions cannot be used for the preparation of the halogen acid ?
Which amongst the following reactions cannot be used for the preparation of the halogen acid ?
A. `2KBr + H_2SO_4 (conc.)to K_2SO_4 +2HBr`
B. `2NaCl +H_2SO_4(conc.)to NaHSO_4 + HCl`
C. `NaHSO_4 + NaCl to Na_2SO_4 +HCl`
D. `CaF_2 + H_2SO_4 (conc.) to CaSO_4 + 2HF`
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Correct Answer - A
Conc. `H_2SO_4` cannot be used for the preparation of HBr and HI This is because conc. `H_2SO_4` can easily oxidise HBr and HI to `Br_2` and `I_2` respectively
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