NEET Chemistry (general) MCQ Question
Which of the following statements about the qualitative analysis of salts is correct?
The presence of Mg2+ ions can be confirmed by adding disodium hydrogen phosphate and scratching the test tube walls.
The borax bead test is used exclusively for uncolored salts to ensure accurate results.
Heating a salt that evolves gas indicates the presence of carbonate ions.
The formation of a white precipitate in the barium sulfate test confirms the presence of sulfate ions in the salt.
Correct Answer
Detailed Explanation
Statement A is correct as the formation of a white crystalline precipitate of magnesium ammonium phosphate indicates the presence of Mg2+ ions when disodium hydrogen phosphate is added. Statement B is incorrect because the borax bead test is specifically for colored salts. Statement C is misleading since not all gases evolved indicate carbonate presence. Statement D is incorrect because the white precipitate in the barium sulfate test confirms sulfate ions, not their absence.
Found an issue with this question?