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【Daily Question】Chemical Analysis Version 2020.2.7

2020-02-07View Original

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Multiple-choice question: When the solution obtained after melting an organic compound with sodium is acidified with dilute HAc and then dilute Pb(Ac)2 solution is added, a black precipitate forms; this indicates that the compound contains the element ( ). A, N B, S C, I D, Cl B

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