Question:
Fehling's solution-A consists of an aqueous solution of copper sulphate and Fehling's solution-B consists of an alkaline solution of X. What is X?
Fehling's solution-A consists of an aqueous solution of copper sulphate and Fehling's solution-B consists of an alkaline solution of X. What is X?
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Fehling Reagent:
\[
\text{Fehling A} = CuSO_4
\]
\[
\text{Fehling B} = \text{Rochelle salt + NaOH}
\]
Updated On: Jun 22, 2026
- \(AgNO_3\)
- Rochelle salt
- Sodium hypohalite
- Sodium citrate \bigskip
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The Correct Option is B
Solution and Explanation
Concept:
Fehling's reagent is prepared freshly by mixing Fehling A and Fehling B.
Step 1: Identify Fehling solution A.
Fehling A is \[ CuSO_4 \] solution.
Step 2: Identify Fehling solution B.
Fehling B contains: \[ \text{Sodium potassium tartrate} \] (commonly called Rochelle salt) along with sodium hydroxide.
Step 3: State its function.
Rochelle salt forms a soluble complex with \(Cu^{2+}\) ions and prevents precipitation of copper hydroxide. Hence \[ X=\text{Rochelle Salt} \] \[ \boxed{\text{Answer = (B)}} \]
Step 1: Identify Fehling solution A.
Fehling A is \[ CuSO_4 \] solution.
Step 2: Identify Fehling solution B.
Fehling B contains: \[ \text{Sodium potassium tartrate} \] (commonly called Rochelle salt) along with sodium hydroxide.
Step 3: State its function.
Rochelle salt forms a soluble complex with \(Cu^{2+}\) ions and prevents precipitation of copper hydroxide. Hence \[ X=\text{Rochelle Salt} \] \[ \boxed{\text{Answer = (B)}} \]
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