A solution of metal hydroxide (MOH) with copper sulphate and mixed tartarate of metal M with another — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Fehling's solution is used to detect aldehyde (—CHO) groups and consists of CuSO4 and Rochelle salt in alkaline solution. Step 2: Rochelle salt is sodium potassium tartrate, which is a mixed tartrate of sodium (Na) and potassium (K) (both Group 1 alkali metals). Step 3: The metal hydroxide (MOH) is typically NaOH (where M = Na) and the mixed tartrate contains sodium and potassium, making the metal pair potassium (K) and sodium (Na), corresponding to option (a).