Question:
Fehling's solution is a mixture of:
Fehling's solution is a mixture of:
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Fehling's solution is commonly used to detect reducing sugars, and the reaction is based on the reduction of copper(II) ions.
Updated On: Apr 24, 2025
- Copper sulfate and sodium hydroxide
- Sodium hydroxide and potassium cyanide
- Copper sulfate and potassium cyanide
- Copper sulfate and sodium tartrate
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The Correct Option is A
Solution and Explanation
Fehling's solution is used to test for reducing sugars. It is a mixture of two solutions:
- Fehling's solution A: A solution of copper(II) sulfate (\( \text{CuSO}_4 \)).
- Fehling's solution B: A solution of sodium hydroxide (\( \text{NaOH} \)) and sodium tartrate.
When these two solutions are mixed together, they form a blue complex. The presence of a reducing sugar will reduce the copper(II) ions to copper(I) ions, resulting in the formation of a red precipitate of copper(I) oxide.
Thus, the correct mixture is copper sulfate and sodium hydroxide, and the answer is (A).
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