Question:
Identify the correct order of acidity of hydrides of 16$^{th}$ group elements from the following.
Identify the correct order of acidity of hydrides of 16$^{th}$ group elements from the following.
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For hydrides in a group, acidity increases down the group due to a decrease in bond dissociation enthalpy.
Updated On: Apr 30, 2026
- $H_2O > H_2S > H_2Se > H_2Te$
- $H_2Te > H_2O > H_2S > H_2Se$
- $H_2Te > H_2Se > H_2S > H_2O$
- $H_2Te > H_2Se > H_2O > H_2S$
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Acidity depends on the ease of release of $H^+$ ions, which is determined by the bond dissociation enthalpy of the $M-H$ bond.
Step 2: Analysis
- As we go down the group (O to Te), the size of the central atom increases. - Consequently, the $M-H$ bond length increases and bond strength decreases. - Weak bonds break more easily, making the hydride more acidic.
Step 3: Conclusion
The acidity increases in the order: $H_2O < H_2S < H_2Se < H_2Te$.
Final Answer: (C)
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