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

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$\underset{conc.}{{CaF}_{2} + H_{2} {SO}_{4} \to {CaSO}_{4} + 2 HF}$

$\underset{conc.}{NaCl} + \underset{H_{2} {SO}_{4}}{} \to {NaHSO}_{4} + HCl$

$\underset{conc.}{NaBr} + \underset{H_{2}}{{SO}_{4}} \to \underset{{NaHSO}_{4}}{} + HBr$

${PI}_{3} + 3 H_{2} O \to H_{3} {PO}_{3} + 3 HI$

answer is C.

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Detailed Solution

Sulphuric acid oxidizes $HBr (or HI)$ to ${Br}_{2} (or I_{2})$ . The halides $H B r$ and $H I$ are prepared by hydrolysis of phosphorus trihalides with cold water

$\begin{aligned} {PX}_{3} + 3 H_{2} O \to H_{3} {PO}_{3} + 3 HX \\ (X = Br or I) \end{aligned}$

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