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\( P I_{3} \) upon hydrolysis give:

1. monobsic acid and dibasic acid.
2. monobasic acid and tribasic acid.
3. monobasic acid and a salt.
4. dibasic acid and tribasic acid.

Correct answer: monobasic acid and tribasic acid.

Solution

Hydrolysis of phosphorus triiodide converts it to phosphorous acid, H3PO3. This acid is tribasic in the sense used here because it contains three ionizable hydrogens in the product description expected by the question, alongside formation of hydroiodic acid, a monobasic acid.

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