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Grade 12th passAIIMS MBBS

Plz solve this problem (question is mentioned in attached image)

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Profile image of RAMESH kumawat
8 Years agoGrade 12th pass
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Profile image of Sushmita
8 Years ago
I hope  4th one is feels reaction
Phosphorus oxidation state from +5 to +3 
 Chlorine oxidation state -1 to 0
Phosphorus reduced
Chlorine got oxidised