The pair in which phosphorous atoms have a formal oxidation state of +3 is :
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- Orthophosphorous and pyrophosphorous acids
- Pyrophosphorous and hypophosphoric acids
- Orthophosphorus and hypophosphoric acids
- Pyrophosphorous and pyrophosphoric acids
The Correct Option is A
Solution and Explanation
Pyrophosphorous acid \(\mathrm{H_4P_2O_5}\): \(4 + 2x - 10 = 0\), so \(x = +3\).
Hypophosphoric acid \(\mathrm{H_4P_2O_6}\): \(4 + 2x - 12 = 0\), so \(x = +4\).
Pyrophosphoric acid \(\mathrm{H_4P_2O_7}\): \(4 + 2x - 14 = 0\), so \(x = +5\).
Only orthophosphorous and pyrophosphorous acids both have P in +3.
Answer: (1) Orthophosphorous and pyrophosphorous acids
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