Practical / Qualitative Analysis
15 JEE Main questions · Chemistry
Lead ion confirmatory tests
Consider the following reactions.
(Hot solution)
In the above reactions, A, B and X are respectively.
- (1), and
- (2), and
- (3), and
- (4), and
Chromyl chloride test
On heating a mixture of common salt and in equal amount along with concentrated in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are :- (1) and
- (2) and
- (3) and
- (4) and
Primary standard in titrimetry
Identify the correct statements :- (A)Hydrated salts can be used as primary standard.
- (B)Primary standard should not undergo any reaction with air.
- (C)Reactions of primary standard with another substance should be instantaneous and stoichiometric.
- (D)Primary standard should not be soluble in water.
- (E)Primary standard should have low relative molar mass.
- (1)A, B, C and E only
- (2)A, B, and C only
- (3)A, B and E only
- (4)D and E only
Functional group detection tests
Match List-I with List-II.Choose the correct answer from the options given below :List-I List-II Functional group (detection) Change observed during detection (A) Unsaturation (Baeyer's test) (I) Red colour Appears (B) Alcoholic group (Ceric ammonium nitrate test) (II) Silver mirror appears (C) Aldehyde group (Tollen's reagent) (III) Violet colour appears (D) Phenolic group ( test) (IV) Discharge of pink colour - (1)A-III, B-IV, C-II, D-I
- (2)A-III, B-IV, C-I, D-II
- (3)A-IV, B-I, C-II, D-III
- (4)A-IV, B-III, C-II, D-I
Solubility of metal chlorides
Consider three metal chlorides x, y and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. x, y and z are respectively- (1), AgCl and
- (2)AgCl, and
- (3), and
- (4), AgCl and
Group five cation precipitation
In the Group analysis of cations, & are precipitated respectively as- (1)sulphide & sulphide
- (2)hydroxide & carbonate
- (3)carbonate & carbonate
- (4)chromate & sulphide
Nitrite ion test
Given below are two statements:
Statement I: Griess–Ilosvay test is used for the detection of nitrite ion, which involves the use of sulphanilic acid and -naphthylamine reagent.
Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with -naphthylamine forms an azo-dye.
In the light of the above statements, choose the correct answer from the options given below
- (1)Statement I is false but Statement II is true
- (2)Both Statement I and Statement II are true
- (3)Statement I is true but Statement II is false
- (4)Both Statement I and Statement II are false
We corrected a printing error in the original paper
Source printed “Griss–Ilosvay test”.
Distinguishing tests for organic compounds
Match List-I with List-II.Choose the correct answer from the options given below :List-I List-II Mixture of Compounds Reagent used to distinguish A. Diethyl amine + Ethyl amine I. Bromine water B. Acetaldehyde + Acetone II. + KOH, C. Ethanol + Phenol III. Neutral D. Benzoic acid + Cinnamic acid IV. Ammoniacal silver nitrate - (1)A-IV, B-II, C-I, D-III
- (2)A-IV, B-II, C-III, D-I
- (3)A-II, B-IV, C-I, D-III
- (4)A-II, B-IV, C-III, D-I
We corrected a printing error in the original paper
Source printed “Ammonical silver nitrate”.
Salt analysis barium and phosphate
A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc. and ammonium molybdate, it resulted in a canary yellow precipitate. The cation and anion present in the salt are respectively.- (1) and
- (2) and
- (3) and
- (4) and
We corrected a printing error in the original paper
Source printed “it resulted a canary yellow precipitate”.
Borax bead test
Among , , and , the ion that shows positive borax bead test and with highest ionisation enthalpy is:- (1)
- (2)
- (3)
- (4)
Cation group reagents
Among , , and , identify the one that gets precipitated out while passing in presence of as group reagent. The highest possible oxidation state of the corresponding metal is- (1)
- (2)
- (3)
- (4)
Functional group tests
Match the LIST-I with LIST-IIChoose the correct answer from the options given below :List-I List-II Compound Test A. 
I Hinsberg's reagent test B. 
II Phthalein dye test C. 
III. Lucas test D. 
IV. Tollen's test - (1)A-III, B-I, C-IV, D-II
- (2)A-III, B-IV, C-I, D-II
- (3)A-I, B-III, C-II, D-IV
- (4)A-I, B-II, C-III, D-IV
Primary standards and indicators
Statement I : Sodium dichromate and potassium dichromate are classified as primary standard in titrimetric analysis.
Statement II : Phenolphthalein is a weak base, therefore it dissociates in acidic medium.
In the light of the above statements, choose the correct answer from the options given below
- (1)Both Statement I and Statement II are true
- (2)Both Statement I and Statement II are false
- (3)Statement I is true but Statement II is false
- (4)Statement I is false but Statement II is true
Sulphur dioxide dichromate test
A paper dipped in a dil. solution of ‘X' upon treatment with gas turns into green. The compound ‘X' is :- (1)KI-starch
- (2)
- (3)
- (4)
Brown ring test
Treatment of a gas ‘X' with a freshly prepared ferrous sulphate solution gives a compound ‘Y' as a brown ring. The compounds X and Y are.- (1) and
- (2) and
- (3) and
- (4) and