Question

Arrange the following hydrides in increasing acidic strength.

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

Answer 1

• Acidic strengh $\propto$ stablity of anion
• Stablity order $T{e}^{2-}>S{e}^{2-}>S^{2-}>O^{2-}$
• As we go down the group, the size increases due to which the -ve charge is stabilized by diffusion.