NEET Chemistry (general) MCQ Question
Which of the following statements about the qualitative analysis of magnesium ions is correct?
The presence of magnesium ions is confirmed by the formation of a white crystalline precipitate with disodium hydrogen phosphate.
Magnesium ions can be detected by their characteristic color change when heated in a flame.
The presence of magnesium ions is indicated by the evolution of a colorless gas when treated with dilute HNO3.
Magnesium ions can be inferred from effervescence when mixed with warm dilute sulfuric acid.
Correct Answer
Detailed Explanation
The presence of Mg²⁺ ions is confirmed by the formation of magnesium ammonium phosphate, indicated by a white crystalline precipitate when disodium hydrogen phosphate is added, as stated in the context. Other options reflect common misconceptions.
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