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Which of the following reactions regarding the preparation of hydrogen halide is not correct?

$\begin{array}{1 1}CaF_2+H_2SO_4\underrightarrow{\text{Conc}} CaSO_4+2HF\\NaCl+H_2SO_4\underrightarrow{\text{(Conc)}} NaHSO_4+HCl\\NaBr+H_2SO_4\rightarrow NaHSO_4+HBr\\PI_3+3H_2O\rightarrow H_3PO_3+3HI\end{array} $

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Answer : $NaBr+H_2SO_4\rightarrow NaHSO_4+HBr$
Sulphuric acid oxidizes HBr(or H) to $Br_2$ (or $I_2)$.The halides HBr and HI are prepared by hydrolysis of phosphorus trihalides with cold water.
$PX_3+3H_2O\rightarrow H_3PO_3+3HX$
X=Br or I
answered Jul 28, 2014 by sreemathi.v
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