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Which pair of oxyacids of phosphorous et...

Which pair of oxyacids of phosphorous et contain `'P - H'` bonds? 

A

`H_(3)PO_(4), H_(3)PO_(3)`

B

`H_(3)PO_(5), H_(4)P_(2)O_(7)`

C

`H_(3)PO_(3), H_(3)PO_(2)`

D

`H_(3)PO_(2), HPO_(3)`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which pair of oxyacids of phosphorus contain 'P-H' bonds, we will analyze the structures of the given oxyacids. ### Step-by-Step Solution: 1. **Identify the Oxyacids**: The oxyacids of phosphorus we will consider are: - H₃PO₄ (Phosphoric Acid) - H₃PO₃ (Phosphorous Acid) - H₃PO₂ (Hypophosphorous Acid) - H₄P₂O₇ (Pyrophosphoric Acid) - H₃PO₅ (Perphosphoric Acid) 2. **Draw the Structures**: - **H₃PO₄**: - Structure: P is bonded to four oxygen atoms, with three -OH groups and one =O (double bond). - **H₃PO₃**: - Structure: P is bonded to three oxygen atoms, with two -OH groups and one =O (double bond). - **H₃PO₂**: - Structure: P is bonded to two oxygen atoms, with one -OH group and one =O (double bond), and one -H directly bonded to P. - **H₄P₂O₇**: - Structure: P is bonded to multiple oxygen atoms, but it primarily contains P-O bonds. - **H₃PO₅**: - Structure: Similar to H₃PO₄ but contains an additional oxygen in a peroxide linkage. 3. **Identify P-H Bonds**: - **H₃PO₄**: No P-H bond. - **H₃PO₃**: Contains P-H bonds (two -OH groups and one -H directly bonded to P). - **H₃PO₂**: Contains P-H bonds (one -OH group and one -H directly bonded to P). - **H₄P₂O₇**: No P-H bond. - **H₃PO₅**: No P-H bond. 4. **Conclusion**: The oxyacids that contain 'P-H' bonds are **H₃PO₂ (Hypophosphorous Acid)** and **H₃PO₃ (Phosphorous Acid)**. ### Final Answer: The pair of oxyacids of phosphorus that contain 'P-H' bonds are **H₃PO₂ and H₃PO₃**.
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