Questions
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
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Correct option is B
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.Similar Questions
Which of the following properties increases on going down from
F to I in Group VII-A of the periodic table
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