Which of the following statement is incorrect? (I) In S2O3^2- both sulphur are different in nature ( — Qualitative and Quantitative Analysis Chemistry Question
Question
Which of the following statement is incorrect? (I) In S2O3^2- both sulphur are different in nature (II) Sodium acetate and lead acetate on heating giving same type of product, whereas Mn, Sn, Fe oxalate salt giving different type of products. (III) Aqueous solution OCl-, S2- and CO3^2- basic in nature (IV) NO2- oxidises I- whereas Br2 and Cl2 oxidises NO2-
💡 Solution & Explanation
Step 1: The cobalt nitrate test is used to identify certain metal ions (like Zn2+, Al3+, Mg2+) that form characteristic colored mixed oxides upon heating on a charcoal block with cobalt nitrate. Step 2: Zinc salts react with cobalt nitrate to form cobalt zincate, CoZnO2, which has a characteristic green color. Step 3: This green mass is historically known as Rinmann's green. Hence, zinc salts give a green color, which corresponds to option (a).