Question:
Which of the following orders are correct for the stated property?
Which of the following orders are correct for the stated property?
Show Hint
For oxyacids of the same central atom:
More oxygen atoms $\Rightarrow$ stronger acid.
Hence:
\[
HClO_4>HClO_3>HClO_2>HOCl
\]
Updated On: Jun 22, 2026
- I, II only
- II, III only
- I, III only
- I, II, III \bigskip
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
The question involves trends in thermal stability, bond strength and acidity. These trends arise from changes in bond length, bond strength and oxidation state.
Step 1: Check Statement I.
Thermal stability of hydrogen halides depends on H--X bond strength. As we move down the group: \[ F \rightarrow Cl \rightarrow Br \rightarrow I \] bond length increases and bond strength decreases. Therefore: \[ HF>HCl>HBr>HI \] Thus Statement I is correct.
Step 2: Check Statement II.
Bond dissociation enthalpy of hydrides of Group 16 decreases down the group because atomic size increases. Hence: \[ H_2O>H_2S>H_2Se>H_2Te \] Therefore Statement II is correct.
Step 3: Check Statement III.
For oxyacids of chlorine: \[ HOCl,\ HClO_2,\ HClO_3,\ HClO_4 \] Acidity increases with oxidation state of chlorine. Oxidation states: \[ +1,\ +3,\ +5,\ +7 \] Therefore: \[ HClO_4>HClO_3>HClO_2>HOCl \] Hence Statement III is also correct.
Step 4: Final conclusion.
All three statements are correct. \[ \boxed{\text{I, II and III}} \]
Step 1: Check Statement I.
Thermal stability of hydrogen halides depends on H--X bond strength. As we move down the group: \[ F \rightarrow Cl \rightarrow Br \rightarrow I \] bond length increases and bond strength decreases. Therefore: \[ HF>HCl>HBr>HI \] Thus Statement I is correct.
Step 2: Check Statement II.
Bond dissociation enthalpy of hydrides of Group 16 decreases down the group because atomic size increases. Hence: \[ H_2O>H_2S>H_2Se>H_2Te \] Therefore Statement II is correct.
Step 3: Check Statement III.
For oxyacids of chlorine: \[ HOCl,\ HClO_2,\ HClO_3,\ HClO_4 \] Acidity increases with oxidation state of chlorine. Oxidation states: \[ +1,\ +3,\ +5,\ +7 \] Therefore: \[ HClO_4>HClO_3>HClO_2>HOCl \] Hence Statement III is also correct.
Step 4: Final conclusion.
All three statements are correct. \[ \boxed{\text{I, II and III}} \]
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