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The reaction of Pb(NO 3 ) 2 and NaCl in water produces a precipitate that dissolves upon the addition of HCl of appropriate concentration. The dissolution of the precipitate is due to formation of

1. PbCl 2
2. PbCl 4
3. [PbCl 4 ] 2–
4. [PbCl 6 ] 2–

Correct answer: [PbCl 4 ] 2–

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