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Assertion : The pH of NH(4)Cl solution i...

Assertion : The pH of `NH_(4)Cl` solution in water is less than 7 and pH of `CH_(3)COONa` solution is more than 7.
Reason : `NH_(4)Cl` is a salt of weak `NH_(4)OH` and strong acid HCl whereas `CH_(3)COONa` is salt of a weak acid `CH_(3)COOH` and strong base NaOH.(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

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 both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that the pH of `NH4Cl` solution in water is less than 7 and the pH of `CH3COONa` solution is more than 7. - `NH4Cl` is a salt formed from the weak base `NH4OH` (ammonium hydroxide) and the strong acid `HCl` (hydrochloric acid). When dissolved in water, `NH4Cl` dissociates into `NH4+` and `Cl-` ions. The `NH4+` ion can donate protons (H+) to water, making the solution acidic (pH < 7). - `CH3COONa` is a salt formed from the weak acid `CH3COOH` (acetic acid) and the strong base `NaOH` (sodium hydroxide). When dissolved in water, `CH3COONa` dissociates into `CH3COO-` and `Na+` ions. The `CH3COO-` ion can accept protons from water, making the solution basic (pH > 7). 2. **Conclusion on Assertion**: - Therefore, the assertion is true: the pH of `NH4Cl` is less than 7, and the pH of `CH3COONa` is more than 7. 3. **Understanding the Reason**: - The reason states that `NH4Cl` is a salt of a weak base (`NH4OH`) and a strong acid (`HCl`), while `CH3COONa` is a salt of a weak acid (`CH3COOH`) and a strong base (`NaOH`). - This statement is also true as it correctly identifies the nature of the salts and their components. 4. **Conclusion on Reason**: - Since the reason accurately explains why the pH of `NH4Cl` is less than 7 and the pH of `CH3COONa` is more than 7, the reason is indeed the correct explanation for the assertion. 5. **Final Evaluation**: - Both the assertion and the reason are true, and the reason correctly explains the assertion. ### Final Answer: (a) If both assertion and reason are true and reason is the correct explanation of assertion.
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