NEET Chemistry Functional Group Tests MCQ Question
In the qualitative analysis of cations, which of the following reactions can be used to confirm the presence of Pb2+ ions by forming a soluble complex in hot NaOH solution?
PbCrO4 + 4NaOH → Na2[Pb(OH)4] + Na2CrO4
PbSO4 + 2NaOH → Na2SO4 + Pb(OH)2
PbI2 + NaOH → No reaction
PbCl2 + 2NaOH → 2NaCl + Pb(OH)2
Correct Answer
Detailed Explanation
The yellow precipitate of lead chromate (PbCrO4) is soluble in hot NaOH, forming sodium tetrahydroxoplumbate (II), as described in NCERT context.
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