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Salt Analysis - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main
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16 Questions around this concept.
Solve by difficulty
During the qualitative analysis of salt with cation $\mathrm{Y}^{2+}$, addition of a reagent $(\mathrm{X}) {\text { to alkaline solution }}$ of the salt gives a bright red precipitate. The reagent $(\mathrm{X})$ and the cation $\left(\mathrm{Y}^{2+}\right)$ present respectively are:
$25 m L$ of silver nitrate solution $(1 M)$ is added dropwise to $25 m L$ of potassium iodide (1.05M) solution. The ion(s) present in very small quantity in the solution is/are
Match List I with List II:
|
LIST I (Precipitating reagent and conditions) |
LIST II (Cation) |
||
| A. | $\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}$ | I. | $\mathrm{Mn}^{2+}$ |
| B. | $\mathrm{NH}_4 \mathrm{OH}+\mathrm{Na}_2 \mathrm{CO}_3$ | II. | $\mathrm{Pb}^{2+}$ |
| C. | $\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}+\mathrm{H}_2 \mathrm{~S}$ gas | III. | $\mathrm{Al}^{3+}$ |
| D. | dilute $\mathrm{HCl}$ | IV. | $\mathrm{Sr}^{2+}$ |
Choose the correct answer from the options given below:
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Which compound give white turbidity within 5 minutes with lucas reagent:
Which compound gives violet colour with FeCl3 solution:
Which compound gives yellow orange precipitate with 2,4 dinitrophenylhydrazine:
Which gas is evolved when NaOH is added to NH4Cl solution:
Which is a primary standard solution:
Which metal is used in Lassaigne's test:
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Concepts Covered - 1
Introduction to Salt Analysis:
Systematic analysis of an inorganic salt involves the following steps:
(i) Preliminary examination of solid salt and its solution.
(ii) Determination of anions by reactions carried out in solution (wet tests) and confirmatory tests.
(iii) Determination of cations by reactions carried out in solution (wet tests) and confirmatory tests.
Preliminary examination of a salt often gives important information, which simplifies further course of analysis. Although the results of these tests are not conclusive but sometimes they give quite important clues for the presence of certain anions or cations. These tests can be performed within a few minutes. These involve noting the general appearance and physical properties, such as colour, smell, solubility etc. of the salt. Heating of dry salt, blowpipe test, flame tests, borax bead test, sodium carbonate bead test, charcoal cavity test etc. come under dry tests.
Gases evolved in the preliminary tests with dil. H2SO4/dil. HCl and conc. H2SO4 also give good indication about the presence of acid radicals. Preliminary tests should always be performed before starting the confirmatory tests for the ions.
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