Q.

Which reactions are used for the preparation of the halogen acid?

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a

2KI+H2SO4⟶K2SO4 (conc.) +2HI

b

CaF2+H2SO4⟶CaSO4 (conc.) +2HF

c

NaCl (conc.) H2SO4 ⟶NaHSO4+HCl

d

2KBr (conc.) +SO4 ⟶K2SO4+2HBr

answer is B.

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Detailed Solution

Correct (l) & (4) ;HBr and 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⊖&I⊖ions are oxidized to Br2 and I2 respectively.
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Which reactions are used for the preparation of the halogen acid?