Question

Which of the following hydrides is most acidic?

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

Answer 1

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

we know that as we more down the group the size of the atoms \ions of the elements in that particular group gets increasing. in the oxygen family size of the ions follows the order

$O^{2-}<S^{2-}<{Se}^{2-}<{Te}^{2-}$

now in their corresponding compounds, hydrogen will be more strongly bonded with $O^{2-}$ and least strongly with ${Te}^{2-}$ because of larger size of ${Te}^{2-}$, so it will be very easy to remove H+ ions from the other specific presents.so $H_{2}Te$ is most acidic hydride.