Which is not appropriate method of making orthophosphoric acid? (A) \( \mathrm{P}_{4} \mathrm{O}...

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Which is not appropriate method of making orthophosphoric acid?
(A) \( \mathrm{P}_{4} \mathrm{O}_{10}+6 \mathrm{H}_{2} \mathrm{O} \longrightarrow 4 \mathrm{H}_{3} \mathrm{PO}_{4} \)
(B) \( \mathrm{PH}_{3}+2 \mathrm{O}_{2} \longrightarrow \mathrm{H}_{3} \mathrm{PO}_{4} \)
(C) \( \mathrm{P}_{4}+16 \mathrm{H}_{2} \mathrm{O} \longrightarrow 4 \mathrm{H}_{3} \mathrm{PO}_{4}+2 \mathrm{H}_{2} \)
(D) \( \mathrm{PCl}_{5}+4 \mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{H}_{3} \mathrm{PO}_{4}+5 \mathrm{HCl} \)
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