Multiple Choice Questions (MCQs) for JEE Chemistry: Qualitative Salt Analysis
Review structured MCQ sets for JEE Chemistry Qualitative Salt Analysis. Built according to official JEE guidelines, these downloadable questions support daily revision and core concept reinforcement.
Practice Qualitative Salt Analysis MCQs for JEE Chemistry
View or download the dedicated Qualitative Salt Analysis MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Chemistry evaluations.
Multiple Choice Questions
(a) \( \ce{K2S} \)
(b) \( \ce{K2SO3} \)
(c) S
(d) \( \ce{MnO2} \)
Show Answer & Explanation
Answer: (c) S
Explanation:
1. \( \ce{H2S} \) is oxidised to sulphur, and \( \ce{MnO4^-} \) is reduced to \( \ce{Mn^{2+}} \).
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{AgCl} \)
(b) \( \ce{AgBr} \)
(c) \( \ce{AgI} \)
(d) none of these
Show Answer & Explanation
Answer: (c) \( \ce{AgI} \)
Explanation:
1. AgCl dissolves readily, AgBr slightly, and AgI is insoluble even in concentrated ammonia.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{Cr^{3+}} \) and \( \ce{Fe^{3+}} \)
(b) \( \ce{Zn^{2+}} \) and \( \ce{Pb^{2+}} \)
(c) \( \ce{Al^{3+}} \) and \( \ce{Cr^{3+}} \)
(d) \( \ce{Al^{3+}} \) and \( \ce{Zn^{2+}} \)
Show Answer & Explanation
Answer: (a) \( \ce{Cr^{3+}} \) and \( \ce{Fe^{3+}} \)
Explanation:
1. Cr(OH)3 dissolves in excess alkali (as chromite) while Fe(OH)3 does not, so they can be separated.
2. The other pairs are both amphoteric and dissolve.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) oxidise any remaining \( \ce{H2S} \)
(b) increase ionisation of ammonium hydroxide
(c) convert ferrous ion into ferric ion
(d) form nitrates which give granular precipitates
Show Answer & Explanation
Answer: (c) convert ferrous ion into ferric ion
Explanation:
1. Group III tests need iron as Fe(III), so ferrous ions are oxidised by boiling with conc. nitric acid.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{Cr2O7^{2-}} \) ions are green
(b) \( \ce{Cu^{2+}} \) ions are green
(c) both ions are green
(d) \( \ce{Cu^{2+}} \) ions are blue and \( \ce{Cr2O7^{2-}} \) ions are yellow
Show Answer & Explanation
Answer: (d) \( \ce{Cu^{2+}} \) ions are blue and \( \ce{Cr2O7^{2-}} \) ions are yellow
Explanation:
1. Blue \( \ce{Cu^{2+}} \) and yellow-orange dichromate together appear green.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{Ag(NH3)^+} \) and \( \ce{Cl^-} \)
(b) \( \ce{Ag^+, NH4^+} \) and \( \ce{Cl^-} \)
(c) \( \ce{Ag2(NH3)^+} \) and \( \ce{Cl^-} \)
(d) \( \ce{[Ag(NH3)2]^+} \) and \( \ce{Cl^-} \)
Show Answer & Explanation
Answer: (d) \( \ce{[Ag(NH3)2]^+} \) and \( \ce{Cl^-} \)
Explanation:
1. \( \ce{AgCl + 2NH3 -> [Ag(NH3)2]^+ + Cl^-} \).
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) tetraborate
(b) orthoborate
(c) double oxide
(d) metaborate
Show Answer & Explanation
Answer: (d) metaborate
Explanation:
1. On heating, borax gives sodium metaborate and boric anhydride: \( \ce{Na2B4O7 -> 2NaBO2 + B2O3} \).
2. The boric anhydride combines with the metal oxide to give a coloured metaborate.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) HCl
(b) \( \ce{H2S} \) (alkaline)
(c) \( \ce{(NH4)2S} \)
(d) none of these
Show Answer & Explanation
Answer: (b) \( \ce{H2S} \) (alkaline)
Explanation:
1. Group IV (Zn, Mn, Ni, Co) is precipitated by \( \ce{H2S} \) in the presence of \( \ce{NH4Cl} \) and \( \ce{NH4OH} \).
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) the reaction is reversed
(b) water soluble \( \ce{Ca(HCO3)2} \) is formed
(c) vaporisable calcium derivative is formed
(d) none of these
Show Answer & Explanation
Answer: (b) water soluble \( \ce{Ca(HCO3)2} \) is formed
Explanation:
1. \( \ce{CaCO3 + H2O + CO2 -> Ca(HCO3)2} \) is soluble in water.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{FeCl3} \) and \( \ce{CaCO3} \)
(b) \( \ce{AgNO3} \) and KBr
(c) \( \ce{BaCO3} \) and ZnS
(d) \( \ce{Mn(NO3)2} \) and \( \ce{MgSO4} \)
Show Answer & Explanation
Answer: (c) \( \ce{BaCO3} \) and ZnS
Explanation:
1. Both \( \ce{BaCO3} \) and ZnS are insoluble in water but dissolve in dilute HCl to give colourless chlorides.
2. The other mixtures are partly soluble in water or give a coloured solution.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{I^-} \)
(b) \( \ce{S^{2-}} \)
(c) \( \ce{Cl^-} \)
(d) \( \ce{NO3^-} \)
Show Answer & Explanation
Answer: (a) \( \ce{I^-} \)
Explanation:
1. Chlorine oxidises iodide to iodine, which dissolves in chloroform to give a violet layer.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{Ca^{2+}} \)
(b) \( \ce{Ca^{2+}} \) and \( \ce{Sr^{2+}} \)
(c) \( \ce{Ba^{2+}} \) and \( \ce{Sr^{2+}} \)
(d) all the three
Show Answer & Explanation
Answer: (d) all the three
Explanation:
1. Barium, strontium and calcium oxalates are all sparingly soluble in water.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{CO3^{2-}} \)
(b) \( \ce{PO4^{3-}} \)
(c) \( \ce{F^-} \)
(d) \( \ce{Br^-} \)
Show Answer & Explanation
Answer: (c) \( \ce{F^-} \)
Explanation:
1. Silver fluoride is soluble in water.
2. Silver bromide, carbonate and phosphate are precipitated.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{Fe^{2+}} \)
(b) \( \ce{Ni^{2+}} \)
(c) \( \ce{Co^{2+}} \)
(d) \( \ce{Mn^{2+}} \)
Show Answer & Explanation
Answer: (a) \( \ce{Fe^{2+}} \)
Explanation:
1. Fe(II) salts are light green and FeS is black but dissolves readily in dilute HCl.
2. CoS and NiS do not dissolve in dilute HCl.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) in conc. hydrochloric acid
(b) in water
(c) in a solution of ammonium acetate
(d) in conc. nitric acid
Show Answer & Explanation
Answer: (c) in a solution of ammonium acetate
Explanation:
1. Acetate forms the weakly ionised \( \ce{Pb(CH3COO)2} \), so ammonium acetate dissolves \( \ce{PbSO4} \).
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{(NH4)2SnS3} \)
(b) \( \ce{Sn2S2} \)
(c) \( \ce{SnS2} \)
(d) \( \ce{SnS} \)
Show Answer & Explanation
Answer: (c) \( \ce{SnS2} \)
Explanation:
1. Yellow ammonium sulphide oxidises SnS to the thiostannate \( \ce{(NH4)2SnS3} \); acid then precipitates yellow \( \ce{SnS2} \).
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{KIO3} \)
(b) \( \ce{I2} \)
(c) \( \ce{HIO3} \)
(d) \( \ce{HI} \)
Show Answer & Explanation
Answer: (b) \( \ce{I2} \)
Explanation:
1. Conc. sulphuric acid oxidises the HI formed, liberating violet iodine.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{Ba^{2+}} \)
(b) \( \ce{Cr^{3+}} \)
(c) \( \ce{Ca^{2+}} \)
(d) \( \ce{Sr^{2+}} \)
Show Answer & Explanation
Answer: (d) \( \ce{Sr^{2+}} \)
Explanation:
1. Strontium gives a crimson/bright red flame.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{CdS} \)
(b) \( \ce{HgS} \)
(c) \( \ce{CuS} \)
(d) \( \ce{PbS} \)
Show Answer & Explanation
Answer: (b) \( \ce{HgS} \)
Explanation:
1. HgS has an extremely low solubility product and dissolves only in aqua regia.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) \( \ce{BaCrO4} \)
(b) \( \ce{PbCrO4} \)
(c) \( \ce{As2S3} \)
(d) \( \ce{PbI2} \)
Show Answer & Explanation
Answer: (d) \( \ce{PbI2} \)
Explanation:
1. Lead iodide dissolves in hot water and crystallises on cooling as shining golden-yellow flakes called golden spangles.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) zinc sulphide
(b) cadmium sulphide
(c) nickel sulphide
(d) lead sulphide
Show Answer & Explanation
Answer: (b) cadmium sulphide
Explanation:
1. CdS is yellow, ZnS white, NiS black and PbS black.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) nitrate
(b) oxalate
(c) sulphide
(d) sulphate
Show Answer & Explanation
Answer: (d) sulphate
Explanation:
1. Sulphate does not react with either dilute or concentrated sulphuric acid.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) passing \( \ce{H2S} \) in alkaline medium
(b) passing \( \ce{H2S} \) in dry mixture
(c) passing \( \ce{H2S} \) in neutral medium
(d) passing \( \ce{H2S} \) in acid medium
Show Answer & Explanation
Answer: (d) passing \( \ce{H2S} \) in acid medium
Explanation:
1. In acid, only CuS precipitates; NiS remains in solution.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) silver nitrate solution
(b) sodium chloride solution
(c) acidified solution of potassium permanganate
(d) lead acetate solution
Show Answer & Explanation
Answer: (c) acidified solution of potassium permanganate
Explanation:
1. Only ferrous ions decolourise acidified permanganate; ferric ions do not.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
(a) barium
(b) magnesium
(c) strontium
(d) calcium
Show Answer & Explanation
Answer: (a) barium
Explanation:
1. Ba gives an apple-green flame, Sr crimson red and Ca brick red; Mg gives none.
Teacher's Note:
1. Link each observation to its reagent: colour, gas evolved and precipitate are the usual clues in salt analysis.
2. Memorise the confirmatory test for each ion; they are asked repeatedly.
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Qualitative Salt Analysis Objective Questions & Solutions for JEE Chemistry
Download Multiple Choice Questions: Qualitative Salt Analysis (JEE Chemistry)
Review structured objective questions for JEE Chemistry Qualitative Salt Analysis. Built according to official JEE guidelines, these MCQ sets support daily revision and core concept reinforcement.
Concept Clarification for Qualitative Salt Analysis
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FAQs
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