NEET Chemistry Functional Group Tests MCQ Question
What is the purpose of adding NH4OH drop by drop in the lake test for aluminium ions?
To make the solution alkaline and precipitate Al(OH)3
To dissolve Al(OH)3 completely
To enhance the acidity of the solution
To form a soluble complex with aluminium ions
Correct Answer
Detailed Explanation
Adding NH4OH drop by drop makes the solution alkaline, leading to the precipitation of aluminium hydroxide, which adsorbs blue color to form a 'lake'.
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