MCQ
Acidity of diprotic acids in aqueous solutions increases in the order
- ✓$H_2S < H_2Se < H_2Te$
- B$H_2Se < H_2S < H_2Te$
- C$H_2Te < H_2S < H_2Se$
- D$H_2Se < H_2Te < H_2S$
✓
Answer
Correct option: A.
$H_2S < H_2Se < H_2Te$
a
Acidic strength of hydrides increases as the size
Acidic strength of hydrides increases as the size
of central atom increases which weakens the
$\mathrm{M}-\mathrm{H}$ bond. Since, the size increases from $\mathrm{S}$ to $\mathrm{Te}$
thus acidic strength follows the order.
$H_{2} S < H_{2} S e < H_{2} T e$
Acidic nature $\propto \frac{1}{\text { Bond disspciation enthalpy }}$
$S$ to $Te$ size increases, bond dissociation enthalpy
decreases and acidic nature increases.
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