NTA Abhyas JEE Main2020Chemistrys Block ElementsPractice
Concentrated aqueous sodium hydroxide can separate a mixture of
Options
- AA l 3 + and S n 2 +
- BA l 3 + and F e 3 +
- CA l 3 + and Z n 2 +
- DZ n 2 + and P b 2 +
Correct answer
B. A l 3 + and F e 3 +
Step-by-step solution
Concentrated aqueous sodium hydroxide can separate a mixture of A l 3 + and F e 3 + A l 3 + forms white gelatinous precipitate of A l O H 3 , which is soluble in excess of NaOH. A l O H 3 + N a O H → N a A l O 2 + 2 H 2 O F e 3 + forms reddish brown precipitate of F e O H 3 , which is insoluble in excess of NaOH.