In the preparation of HBr or HI, NaX (X : Br, I) is treated with H3PO4 and not by concentrated H2SO4 since,

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Na2PO4 is water insoluble and Na2SO4 is water soluble

Na2SO4 is water soluble and Na2PO4 is water insoluble

H2SO4 oxidizes HX to X2 (Br2,I2)

H2SO4 makes the reaction reversible

answer is C.

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Detailed Solution

HBr or HI cannot be prepared by heating Br⊖ or I⊖with conc. H2SO4 because HBr and HI are strong reducing agents and reduces H2SO4 to SO2 and Br⊖ or I⊖are oxidized to Br2 or I2 respectively.NaX+H2SO4⟶NaHSO4+HXH2SO4+2HX⟶SO2+X2+2H2O(X=Br or I)Hence HBr and HI are prepared by heating Br⊖ or I⊖respectively with H3PO4.3NaBr+H3PO4⟶Na3PO4+3HBr3NaI+H3PO4⟶Na3PO4+3HI

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