Question

Acidity of diprotic acids in aqueous solutions increases in the order

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

Answer 1

The correct option is A $H_{2}S<H_{2}Se<H_{2}Te$

As the atomic size increases down the group, the bond length increases and the bond strength decreases and the cleavage of E - H bond becomes easier thus, more will be the acidity. Thus, the correct order is : $H_{2}S<H_{2}Se<H_{2}Te$.