PCl3+H2O→X+HCl. X is an oxoacid of phosphorus. X on strong heating at 200∘C gives Y and Z. Sum of oxidation numbers of phosphorous in Y and Z is

PCl3+H2O→H3PO3+HClH3PO3→2000CH3PO4+PH35−3=2

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$P C l_{3} + H_{2} O \to X + H C l . X$ is an oxoacid of phosphorus. X on strong heating at $200^{\circ} C$ gives Y and Z. Sum of oxidation numbers of phosphorous in Y and Z is

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answer is 2.

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$P C l_{3} + H_{2} O \to H_{3} P O_{3} + H C l$

$H_{3} P O_{3} \overset{200^{0} C}{\to} H_{3} P O_{4} + P H_{3}$

$5 - 3 = 2$

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