Class 11Chemistry3 Organic Chemistry: Purification and CharacterisationChemical analysis of organic compounds
DifficultThe Lassaigne's extract is boiled with dilute $HNO_3$ before testing for halogens because,
- A$AgCN$ is soluble in $HNO_3$
- BSilver halides are soluble in $HNO_3$
- C$Ag_2S$ is soluble in $HNO_3$
- D$Na_2S$ and $NaCN$ are decomposed by $HNO_3$
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The Lassaigne's extract is boiled with conc. $HNO_3$ while testing for halogens. By doing so it
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Match column $-I$ and column $-II$ with the correct relation:
Column $-I$ Column $-II$ $(i).$ Prussian blue $(a).$ Presence of phosphorus $(ii).$ Yellow precipitate $(b).$ Presence of sulphur $(iii).$ Purple solution $(c).$ Presence of nitrogen $(iv).$ Black precipitate $(d).$ Presence of chlorine
| Column $-I$ | Column $-II$ |
|---|---|
| $(i).$ Prussian blue | $(a).$ Presence of phosphorus |
| $(ii).$ Yellow precipitate | $(b).$ Presence of sulphur |
| $(iii).$ Purple solution | $(c).$ Presence of nitrogen |
| $(iv).$ Black precipitate | $(d).$ Presence of chlorine |
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