Question:
Identify the correct order of acidity of hydrides of \(16^{\text {th }}\) group elements from the following.
Identify the correct order of acidity of hydrides of \(16^{\text {th }}\) group elements from the following.
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Acidity of hydrides rises down the group as the H-E bond becomes longer and weaker.
Updated On: Nov 13, 2026
\(\mathrm{H}_{2}\mathrm{O}>\mathrm{H}_{2}\text{ }\mathrm{S}>\mathrm{H}_{2}\mathrm{Se}>\mathrm{H}_{2}\mathrm{Te}\)
\(\mathrm{H}_{2}\mathrm{Te}>\mathrm{H}_{2}\mathrm{O}>\mathrm{H}_{2}\text{ }\mathrm{S}>\mathrm{H}_{2}\mathrm{Se}\)
\(\mathrm{H}_{2}\mathrm{Te}>\mathrm{H}_{2}\mathrm{Se}>\mathrm{H}_{2}\text{ }\mathrm{S}>\mathrm{H}_{2}\mathrm{O}\)
\(\mathrm{H}_{2}\mathrm{Te}>\mathrm{H}_{2}\mathrm{Se}>\mathrm{H}_{2}\mathrm{O}>\mathrm{H}_{2}\text{ }\mathrm{S}\)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
The acidic strength of hydrides depends on how easily \(\text{H}^{+}\) is released, which depends on the bond strength of the E-H bond.
Step 2: Trend down the group
Going from O to Te, the size of the atom increases, the E-H bond length increases and the bond becomes weaker.
Step 3: Order
Hence acidity increases: \(\text{H}_2\text{O}<\text{H}_2\text{S}<\text{H}_2\text{Se}<\text{H}_2\text{Te}\), i.e. \(\text{H}_2\text{Te}>\text{H}_2\text{Se}>\text{H}_2\text{S}>\text{H}_2\text{O}\).
Final Answer:
The acidity order is H2Te > H2Se > H2S > H2O. \[ \boxed{\text{(C) }\text{H}_{2}\text{Te}>\text{H}_{2}\text{Se}>\text{H}_{2}\text{S}>\text{H}_{2}\text{O}} \]
The acidic strength of hydrides depends on how easily \(\text{H}^{+}\) is released, which depends on the bond strength of the E-H bond.
Step 2: Trend down the group
Going from O to Te, the size of the atom increases, the E-H bond length increases and the bond becomes weaker.
Step 3: Order
Hence acidity increases: \(\text{H}_2\text{O}<\text{H}_2\text{S}<\text{H}_2\text{Se}<\text{H}_2\text{Te}\), i.e. \(\text{H}_2\text{Te}>\text{H}_2\text{Se}>\text{H}_2\text{S}>\text{H}_2\text{O}\).
Final Answer:
The acidity order is H2Te > H2Se > H2S > H2O. \[ \boxed{\text{(C) }\text{H}_{2}\text{Te}>\text{H}_{2}\text{Se}>\text{H}_{2}\text{S}>\text{H}_{2}\text{O}} \]
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