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Which of the correct statement for the given acids?

1. Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid.
2. Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
3. Both are triprotic acids.
4. Both are diprotic acids

Correct answer: Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid

Solution

Phosphinic acid has the structure H2PO(OH), so only one hydrogen is ionizable, making it monoprotic. Phosphonic acid is HPO(OH)2, which has two ionizable OH hydrogens, so it is diprotic.

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