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An Intiative by Sri Chaitanya
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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