Question

Which of the following dissociates to give $H^{+}$ most easily?

• A. $H_{2}O$
• B. $H_{2}S$
• C. $H_{2}Te$
• D. $H_{2}Se$

Answer 1

The correct option is C $H_{2}Te$

Down the group, the bond dissociation energy of $E-H(E=O,S,Se,Te,Po)$ bond decreases. Therefore, $Te-H$ bond is the weakest. Hence, $H_{2}Te$ dissociates to give $H^{+}$ most easily.