Question
Question: Which of the following statements is true?...
Which of the following statements is true?
A
H3PO3 is a stronger acid than H2SO3
B
In aqueous medium HF is a stronger acid than HCl
C
HCIO4 is a weaker acid than HClO3
D
HNO3 is a stronger acid than HNO2
Answer
HNO3 is a stronger acid than HNO2
Explanation
Solution
Higher is the oxidation state of the central atom, greater is the acidity.
Hence, HCIO4 is a stronger acid than HCIO3. 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 hydrogne bonding in Hf, HF is a weaker acid than HCI.