Question

\(\text{HClO}, \text{HClO}_2, \text{HClO}_3, \text{HClO}_4\) (acidic strength)

Answer 1

Order of Increasing Acidic Strength: The acidity of chlorine's oxyacids correlates positively with the oxidation state of chlorine. Acids with chlorine in higher oxidation states have more stable conjugate bases, which enhances their acidic strength. \[ \text{HClO} < \text{HClO}_2 < \text{HClO}_3 < \text{HClO}_4 \]

Answer 2

Order of Decreasing Ionic Character: The ionic character of compounds formed between metals (M) and halogens is largely determined by the electronegativity difference between the two elements. As you move down the halogen group, their electronegativity decreases, which in turn reduces the ionic character of the bond they form with metals. Consequently, the ionic character diminishes from fluoride to iodide. \[ \text{MI} < \text{MBr} < \text{MCl} < \text{MF} \]

Answer 3

Increasing Order of Thermal Stability: Thermal stability of hydrogen halides (HX) decreases down the group due to decreasing bond strength 
(H-F) being the strongest and (H-I) the weakest. \[ HI < HBr < HCl < HF \]