An organic compound contains C, H, N, S and Cl. For the detection of chlorine, the sodium…
Chemistry · JEE Main · NTA Exams — Principles Related To Practical Chemistry
An organic compound contains C, H, N, S and Cl. For the detection of chlorine, the sodium extract of the compound is first heated with a few drops of concentrated HNO3 and then AgNO3 is added to get a white ppt. of AgCl. The digestion with HNO3 before the addition of AgNO3 is
- to prevent the formation of NO2
- to create a common ion effect
- to convert CN- and S2- to volatile HCN and H2S, or else they will interfere with the test forming AgCN or Ag2S
- to prevent the hydrolysis of NaCN and Na2S
Answer
(C) to convert CN - and S 2- to volatile HCN and H 2 S, or else they will interfere with the test forming AgCN or Ag 2 S
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