Which of the following statements is true? (a) H3 PO3 is a stronger acid than H2SO3.

Monjur Alahi

Which of the following statements is true?
(a) H3 PO3 is a stronger acid than H2SO3
(b) In aqueous medium HF is a stronger acid than HCl
(c) HClO4 is a weaker acid than HClO3
(d) HNO3 is a stronger acid than HNO2.


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Salim Ahmed Kawsar

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(d) : Higher is the oxidation state of the central atom, greater is the acidity.
Hence, HClO4 is a stronger acid than HClO3. HNO3 is a stronger acid than HNO2.
Now, greater is the electronegativity and higher is the oxidation state of the central atom, greater is the acidity. Hence H2SO3 is a stronger acid than H3PO3.
Due to higher dissociation energy of H – F bond and molecular association due to hydrogen bonding in HF, HF is a weaker acid than HCl.

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