Fehling's solution 'A' is: (1) aqueous copper sulphate (2) alkaline copper sulphate (3) alkaline sol

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Question

Fehling's solution 'A' is: (1) aqueous copper sulphate (2) alkaline copper sulphate (3) alkaline solution of sodium potassium tartrate (Rochelle's salt) (4) aqueous sodium citrate

Accepted Answer

Correct Answer: a — aqueous copper sulphateStep-by-step Solution:Fehling's solution is a chemical reagent used to test for reducing sugars and aldehydes. It consists of two separate solutions that are mixed just before use:Fehling's solution A: Aqueous copper(II) sulfate (CuSO₄ solution), which provides the Cu²⁺ ions.Fehling's solution B: Alkaline solution of sodium potassium tartrate (Rochelle's salt) and sodium hydroxide. The tartrate acts as a complexing agent to keep Cu²⁺ in solution in the alkaline medium.When mixed, the deep blue complex is formed. Upon heating with an aldehyde, Cu²⁺ is reduced to Cu⁺, forming a brick-red precipitate of Cu₂O. Therefore, Fehling's solution 'A' is aqueous copper sulphate.Key Concepts: Fehling's test for aldehydes (except aromatic), composition of Fehling's A and B, role of Rochelle's salt as a complexing agent, reduction of Cu²⁺ to Cu⁺.

Fehling's solution 'A' is: (1) aqueous copper sulphate (2) alkaline copper sulphate (3) alkaline solution of sodium potassium tartrate (Rochelle's salt) (4) aqueous sodium citrate

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Fehling's solution 'A' is: (1) aqueous copper sulphate (2) alkaline copper sulphate (3) alkaline solution of sodium potassium tartrate (Rochelle's salt) (4) aqueous sodium citrate

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