JEE Main 2016 · 3 Apr · Shift 1 · Chemistry Q46

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ChemistrySingle correct+4 / -1Question 46 of 90

The pair in which phosphorous atoms have a formal oxidation state of +3 is :

Orthophosphorous and pyrophosphorous acids

Pyrophosphorous and hypophosphoric acids

Orthophosphorous and hypophosphoric acids

Pyrophosphorous and pyrophosphoric acids

Answer and worked solution

Official answer: A

Orthophosphorous acid $\ce{H3PO3}$ and pyrophosphorous acid $\ce{H4P2O5}$ both have P in +3. Hypophosphoric acid $\ce{H4P2O6}$ has +4 and pyrophosphoric acid $\ce{H4P2O7}$ has +5.

Topics:Oxoacids Oxidation number

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JEE Main 2016 · 3 Apr · Shift 1, Chemistry question 46