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Assertion : Acidic character of group 16...

Assertion : Acidic character of group 16 hydrides increases from `H_(2)O" to "H_(2)Te`.
Reason : Thermal stablility of hydrides decreases down the group.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the assertion and reason provided: **Assertion:** The acidic character of group 16 hydrides increases from H₂O to H₂Te. **Reason:** The thermal stability of hydrides decreases down the group. ### Step-by-Step Solution: 1. **Understanding Group 16 Hydrides:** - Group 16 elements include oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and polonium (Po). - The hydrides of these elements are H₂O (water), H₂S (hydrogen sulfide), H₂Se (hydrogen selenide), H₂Te (hydrogen telluride), and H₂Po (hydrogen polonide). 2. **Acidic Character of Hydrides:** - The acidic character of hydrides generally increases as we move down the group from H₂O to H₂Te. - This is because the bond strength between the central atom and hydrogen decreases as the size of the central atom increases, making it easier to release H⁺ ions in solution. 3. **Bond Strength and Size:** - As we move down the group, the atomic size increases (O < S < Se < Te < Po), leading to a decrease in bond strength between the hydrogen and the central atom. - Weaker bonds mean that the hydride is more likely to donate a proton (H⁺), thus increasing its acidic character. 4. **Thermal Stability of Hydrides:** - The reason states that the thermal stability of hydrides decreases down the group. This is indeed true. - As the size of the central atom increases, the bond dissociation energy decreases, leading to less thermal stability of the hydrides. 5. **Evaluating the Assertion and Reason:** - Both the assertion and the reason are true. - However, the reason does not directly explain the assertion. The assertion is about acidic character, while the reason discusses thermal stability. 6. **Conclusion:** - Since both the assertion and reason are true, but the reason is not the correct explanation for the assertion, the correct answer is Option 2. ### Final Answer: **Option 2:** Both assertion and reason are true, but reason is not the correct explanation of assertion.
To solve the question, we need to analyze the assertion and reason provided: **Assertion:** The acidic character of group 16 hydrides increases from H₂O to H₂Te. **Reason:** The thermal stability of hydrides decreases down the group. ### Step-by-Step Solution: 1. **Understanding Group 16 Hydrides:** ...
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