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In the preparation of HBr or HI, NaX (X=...

In the preparation of HBr or HI, NaX (X=Br, I) is treated with `H_3PO_4` and not by conc. `H_2SO_4` and since

A

`H_2 SO_4` makes the reaction reversible

B

`H_2 SO_4` oxidises HX to `X_2(Br, I)`

C

`Na_3 PO_4` is water soluble

D

`Na_2 SO_4` is water soluble

Text Solution

Verified by Experts

The correct Answer is:
B
HBr and HI, formed react with conc. `H_2 SO_4` and are oxidised to` Brl_2` and `I_2` respectively.
` 2 HBr + H_2 SO_4 to SO_2 + 2H_2 O + Br_2`
` 2 HI +H_2 SO_4 to SO_2 + 2H_2 O +I+2`
HBr and HI are obtained by heating NaBr and Nal respectively with conc. `H_3 PO_4`
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