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The pair that contains two P –H bonds in each of the oxoacids is :

1. H 3 PO 2 and H 4 P 2 O 5
2. H 4 P 2 O 5 and H 4 P 2 O 6
3. H 4 P 2 O 5 and H 3 PO 3
4. H 3 PO 3 and H 3 PO 2

Correct answer: H 3 PO 2 and H 4 P 2 O 5

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