Class 11Chemistry8-3.Organic Chemistry : Purification and characterizationChemical analysis of organic compounds
DifficultIn Lassaigne's test for the detection of halogens,the sodium fusion extract is first boiled with concentrated nitric acid. This is
- Ato remove silver halides
- Bto decompose $Na_2S$ and $NaCN$,if present
- Cto dissolve $Ag_2S$
- Dto dissolve $AgCN$,if formed
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Similar Questions
The Lassaigne's extract is boiled with conc. $HNO_3$ while testing for halogens. By doing so it
MediumAIPMT 2011
View SolutionWhich one of the following sets of elements can be detected using sodium fusion extract?
Match List-$I$ with List-$II$.
List-$I$ Element detected List-$II$ Reagent used/Product formed $A$. Nitrogen $I$. $Na_2[Fe(CN)_5NO]$ $B$. Sulphur $II$. $AgNO_3$ $C$. Phosphorus $III$. $Fe_4[Fe(CN)_6]_3$ $D$. Halogen $IV$. $(NH_4)_2MoO_4$
Choose the correct answer from the options given below:
| List-$I$ Element detected | List-$II$ Reagent used/Product formed |
| $A$. Nitrogen | $I$. $Na_2[Fe(CN)_5NO]$ |
| $B$. Sulphur | $II$. $AgNO_3$ |
| $C$. Phosphorus | $III$. $Fe_4[Fe(CN)_6]_3$ |
| $D$. Halogen | $IV$. $(NH_4)_2MoO_4$ |
Choose the correct answer from the options given below:
Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?
Medium
View SolutionMatch the compounds in Column $I$ with their characteristic test$(s)$ reaction$(s)$ given in Column $II$.
Column $I$ Column $II$ $A. H_2N-NH_3^+Cl^-$ $p. \text{Sodium fusion extract of the compound gives Prussian blue colour with } FeSO_4$ $B. HO-C_6H_4-CH(NH_3^+)COOH \text{ (with } I^- \text{ counterion)}$ $q. \text{Gives positive } FeCl_3 \text{ test}$ $C. HO-C_6H_4-NH_3^+Cl^-$ $r. \text{Gives white precipitate with } AgNO_3$ $D. (NO_2)_2C_6H_3-NH-NH_3^+Br^-$ $s. \text{Reacts with aldehydes to form the corresponding hydrazone derivative}$
| Column $I$ | Column $II$ |
|---|---|
| $A. H_2N-NH_3^+Cl^-$ | $p. \text{Sodium fusion extract of the compound gives Prussian blue colour with } FeSO_4$ |
| $B. HO-C_6H_4-CH(NH_3^+)COOH \text{ (with } I^- \text{ counterion)}$ | $q. \text{Gives positive } FeCl_3 \text{ test}$ |
| $C. HO-C_6H_4-NH_3^+Cl^-$ | $r. \text{Gives white precipitate with } AgNO_3$ |
| $D. (NO_2)_2C_6H_3-NH-NH_3^+Br^-$ | $s. \text{Reacts with aldehydes to form the corresponding hydrazone derivative}$ |
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