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Q.

In the preparation of HBr or HI,NaX(X = Br,I) is treated with H3PO4 and not by conc.H2SO4 because

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a

H2SO4 makes the reaction reversible

b

H2SO4 oxidises HX to X2(Br2, I2)

c

Na2SO4 is water soluble and  Na3PO4 is water insoluble

d

Na3PO4 is water insoluble and Na2SO4 is water soluble

answer is B.

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Detailed Solution

HBr and HI further get oxidised with H2SO4 and release Br2 and I2 respectively.Thus H3PO4 is used to prepare HBr, HI from NaBr and NaIX-+ SO4-2→H+X2+SO2, where X=Br, IH3PO4 is a non oxidizing acid.
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