Class 11Chemistry3 Organic Chemistry: Purification and CharacterisationChemical analysis of organic compounds
EasyWhy is nitric acid $(HNO_3)$ added to sodium extract before adding silver nitrate $(AgNO_3)$ for testing halogens?
- ATo increase the concentration of $Ag^+$ ions.
- BTo decompose sodium cyanide $(NaCN)$ and sodium sulphide $(Na_2S)$ if present.
- CTo act as a catalyst for the precipitation reaction.
- DTo neutralize the excess sodium metal.
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Similar Questions
Lassaigne's test is used for the detection of which of the following?
Easy
View SolutionAn organic compound on heating with $CuO$ produces $CO_{2}$ but no water. The organic compound may be
Match 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 $II$ |
|---|---|
| $A. H_2N-NH_3^+Cl^-$ | $p. \text{Sodium fusion extract of the compound gives Prussian blue colour with } FeSO_4$ |
| $B. HO-C_6H_4-CH(NH_3^+)COOH \text{ (with } I^- \text{ counterion)}$ | $q. \text{Gives positive } FeCl_3 \text{ test}$ |
| $C. HO-C_6H_4-NH_3^+Cl^-$ | $r. \text{Gives white precipitate with } AgNO_3$ |
| $D. (NO_2)_2C_6H_3-NH-NH_3^+Br^-$ | $s. \text{Reacts with aldehydes to form the corresponding hydrazone derivative}$ |
The blue color obtained in the Lassaigne's test is due to the formation of which compound?
Difficult
View SolutionAssertion : During the test for nitrogen with Lassaigne's extract,on adding $FeCl_3$ solution,sometimes a blood-red coloration is obtained.
Reason : Sulphur is also present along with nitrogen in the organic compound.
Reason : Sulphur is also present along with nitrogen in the organic compound.
MediumAIIMS 2001
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