Class 11Chemistry8-3.Organic Chemistry : Purification and characterizationChemical analysis of organic compounds
MediumWhy is the Lassaigne's extract boiled with concentrated $HNO_3$ before testing for halogens?
- ATo increase the concentration of $NO_3^-$ ions.
- BTo decompose $Na_2S$ and $NaCN$ formed during the fusion process.
- CTo help in the crystallization of $AgCl$.
- DTo increase the solubility product of $AgCl$.
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Similar Questions
Which of the following substances gives a red color when its $Lassaigne's$ extract is treated with alkali and ferric chloride?
Easy
View SolutionMatch Column $-I$ with Column $-II$.
Column $-I$ Column $-II$ $(A).$ Dumas method $(3).$ Nitrogen gas $(B).$ Kjeldahl's method $(5).$ Ammonium sulphate $(C).$ Carius method $(1).$ $AgNO_3$ $(D).$ Chromatography $(2).$ Silica gel $(E).$ Homolytic fission $(4).$ Free radical
| Column $-I$ | Column $-II$ |
|---|---|
| $(A).$ Dumas method | $(3).$ Nitrogen gas |
| $(B).$ Kjeldahl's method | $(5).$ Ammonium sulphate |
| $(C).$ Carius method | $(1).$ $AgNO_3$ |
| $(D).$ Chromatography | $(2).$ Silica gel |
| $(E).$ Homolytic fission | $(4).$ Free radical |
Easy
View SolutionMatch the List-$I$ with List-$II$:
List-$I$ (Reagent) List-$II$ (Functional Group detected) $A$. Sodium bicarbonate solution $I$. Double bond/unsaturation $B$. Neutral ferric chloride $II$. Carboxylic acid $C$. Ceric ammonium nitrate $III$. Phenolic $-OH$ $D$. Alkaline $KMnO_4$ $IV$. Alcoholic $-OH$
Choose the correct answer from the options given below:
| List-$I$ (Reagent) | List-$II$ (Functional Group detected) |
| $A$. Sodium bicarbonate solution | $I$. Double bond/unsaturation |
| $B$. Neutral ferric chloride | $II$. Carboxylic acid |
| $C$. Ceric ammonium nitrate | $III$. Phenolic $-OH$ |
| $D$. Alkaline $KMnO_4$ | $IV$. Alcoholic $-OH$ |
Choose the correct answer from the options given below:
DifficultJEE MAIN 2025
View SolutionIn the Lassaigne's test for the detection of sulfur,which substance is responsible for the formation of black precipitates?
Easy
View SolutionWhich of the following compounds will not give a positive Lassaigne's test for nitrogen?
Medium
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