7. Balance the following oxidation-reduction reaction, which occurs in basic solution.

$$ 1 \mathrm{P}_{4} + \mathrm{a H}_{2} \mathrm{O} + \mathrm{b OH}^{-} \rightarrow \mathrm{c HPO}_{3}^{2-} + \mathrm{d PH}_{3} $$

Question, what is the total number of a + b ?
(A) 3
(B) 4
(C) 5
(D) 6
(E) 7

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統計： A(0), B(0), C(0), D(1), E(0) #3922351

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B1 · 2026/10/12

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本題在考什麼觀念氧化還原反應的平衡法...

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7. Balance the following oxidation-reduction reaction, which occurs in basic solution. $$ 1 \mathrm{P}_{4} + \mathrm{a H}_{2} \mathrm{O} + \mathrm{b OH}^{-} \rightarrow \mathrm{c HPO}_{3}^{2-} + \mathrm{d PH}_{3} $$ Question, what is the total number of a + b ?(A) 3(B) 4(C) 5(D) 6(E) 7