Pyrophosphorus acid, $H_{4} P_{2} O_{5}$

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Contains P in +5 oxidation state

Is dibasic acid

Is strongly reducing in nature

Contains one P- O- P bond

answer is B, C, D.

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Detailed Solution

Pyrophosphorus acid is dibasic acid as it contains two P-OH bonds, strongly reducing in nature due to the presence of two P-H groups and contains one P-O-P bond.
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Hence, B, C and D are the correct answers.

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