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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus
JEE Main levelSingle correct optionDifficulty 2 of 3pn139

Assertion (A): is a dibasic acid even though it has three hydrogen atoms. Reason (R): One hydrogen is bonded directly to phosphorus and is not ionisable. Choose the correct option.

  1. ABoth A and R are true and R is the correct explanation of A.
  2. BBoth A and R are true but R is not the correct explanation of A.
  3. CA is true but R is false.
  4. DA is false but R is true.

Answer: A

H3PO3 has the structure : two O-H hydrogens ionise but the P-H hydrogen does not. Hence it is dibasic and R correctly explains A.
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