Question:
Which among the following salts turns red litmus blue in its aqueous solution?
Which among the following salts turns red litmus blue in its aqueous solution?
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Salt of Strong Base + Weak Acid = Basic solution (pH > 7).
Updated On: Jun 19, 2026
- $CH_{3}COONa$
- $CuCl_{2}$
- $KCl$
- $NaCl$
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Red litmus turns blue in basic (alkaline) solutions.
Step 2: Meaning
A salt turns blue if it is formed from a Weak Acid and a Strong Base.
Step 3: Analysis
- $CH_{3}COONa$ is from $CH_{3}COOH$ (Weak Acid) and $NaOH$ (Strong Base). It undergoes anionic hydrolysis to produce $OH^{-}$ ions. - $NaCl$ and $KCl$ are neutral. - $CuCl_{2}$ is acidic.
Step 4: Conclusion
Hence, $CH_{3}COONa$ is basic and turns red litmus blue. Final Answer: (A)
Red litmus turns blue in basic (alkaline) solutions.
Step 2: Meaning
A salt turns blue if it is formed from a Weak Acid and a Strong Base.
Step 3: Analysis
- $CH_{3}COONa$ is from $CH_{3}COOH$ (Weak Acid) and $NaOH$ (Strong Base). It undergoes anionic hydrolysis to produce $OH^{-}$ ions. - $NaCl$ and $KCl$ are neutral. - $CuCl_{2}$ is acidic.
Step 4: Conclusion
Hence, $CH_{3}COONa$ is basic and turns red litmus blue. Final Answer: (A)
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