Qualitative Analysis PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Qualitative Analysis · Set 1 (Q1-30)
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1. $In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?$ (1) $F e^{3 +}$ (2) $Z n^{2 +}$ (3) $C o^{2 +}$ (4) $N i^{2 +}$ 2. $Consider three metal chlorides x, y and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. x, y and z are respectively$ (1) $CuCl_{2}, AgCl and PbCl_{2}$ (2) $AlCl_{3}, PbCl_{2} and BaCl_{2}$ (3) $MgCl_{2}, AgCl and AlCl_{3}$ (4) $AgCl, Hg_{2} Cl_{2} and PbCl_{2}$ 3. $The Lassiagne's extract is boiled with dil HNO_{3} before testing for halogens because,$ (1) $AgCN is soluble in HNO_{3}$ (2) $Silver halides are soluble in HNO_{3}$ (3) $Ag_{2} S is soluble in HNO_{3}$ (4) $Na_{2} S and NaCN are decomposed by HNO_{3}$ 4. $On passing a gas, ' X^{’}, through Nessler's reagent, a brown precipitate is obtained. The gas ' X^{’} is$ (1) $H_{2} S$ (2) $CO_{2}$ (3) $NH_{3}$ (4) $Cl_{2}$ 5. $During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe^{2 +} ion? [NEET 2024]$ (1) $Dilute hydrochloric acid$ (2) $Concentrated sulphuric acid$ (3) $Dilute nitric acid$ (4) $Dilute sulphuric acid$ 6. $The water quality of a pond was analysed and its BOD was found to be 4. The pond has$ (1) $Highly polluted water$ (2) $Water has high amount of fluoride compounds$ (3) $Very clean water$ (4) $Slightly polluted water$ 7. $Match the List-I with List-II: Cations p \to P b^{2 +}, C u^{2 +} Q \to A 1^{3 +}, F e^{3 +} R \to C o^{2 +}, N i^{2 +} S \to B a^{2 +}, C a^{2 +} Group reaction (i) H_{2} S gas in presence of dilute HC1 (ii) (N H_{4})_{2} C O_{3} in presence of N H_{4} OH (iii) N H_{4} OH in presence of N H_{4} CI (iv) H_{2} S in presence of N H_{4} OH$ (1) $P \to i, Q \to iii, R \to ii, S \to iv$ (2) $P \to iv, Q \to ii, R \to iii, S \to i$ (3) $P \to iii, Q \to i, R \to iv, S \to ii$ (4) $P \to i, Q \to iii, R \to iv, S \to ii$ 8. $The concentration of dissolved Oxygen in water for growth of fish should be more than X ppm and Biochemical Oxygen Demand in clean water should be less than Y ppm. X and Y in ppm are, respectively.X, Y$ (1) $6,5$ (2) $4, 8$ (3) $4, 15$ (4) $6, 12$ 9. $A reagent which gives brilliant red precipitate with Nickel ions in basic medium is$ (1) $sodium nitroprusside$ (2) $neutral FeCl_{3}$ (3) $meta-dinitrobenzene$ (4) $dimethyl glyoxime$ 10. $Formation of which complex, among the following, is not a confirmatory test of P b^{2 +} ions$ (1) $Lead sulphate$ (2) $Lead nitrate$ (3) $Lead chromate$ (4) $Lead iodide$ 11. $Formation of Na_{4} (Fe (CN)_{5} NOS), a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of:$ (1) $Sulphide ion$ (2) $Sulphite ion$ (3) $Sulphate ion$ (4) $Sodium ion$ 12. $In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound (Aqueous tension at 300 K = 15 mmHg) is % .$ (1) $20.87$ (2) $12.57$ (3) $1.257$ (4) $18.67$ 13. $In the Group analysis of cations, Ba^{2 +} & Ca^{2 +} are precipitated respectively as$ (1) $sulphide & sulphide$ (2) $chromate & sulphide$ (3) $carbonate & carbonate$ (4) $hydroxide & carbonate$ 14. $A student has been given 0.314 g of an organic compound and asked to estimate Sulphur. During the experiment, the student has obtained 0.4813 g of barium sulphate. The percentage of sulphur present in the compound is____. (Given Molar mass in gmol^{- 1} S : 32, BaSO_{4} : 233)$ (1) $48.24 %$ (2) $63.15 %$ (3) $21.05 %$ (4) $42.10 %$ 15. $In the wet tests for detection of various cations by precipitation, B a^{2 +} cations are detected by obtaining precipitate of$ (1) $Ba(ox) : Barium oxalate$ (2) $B a C O_{3}$ (3) $Ba (O A c)_{2}$ (4) $B a S O_{4}$ 16. $The normal rain water is slightly acidic and its pH value is 5.6 because of which one of the following ?$ (1) $C O_{2} + H_{2} O \to H_{2} C O_{3}$ (2) $4 N O_{2} + O_{2} + 2 H_{2} OH \to 4 H N O_{3}$ (3) $2 S O_{2} + O_{2} + 2 H_{2} O \to 2 H_{2} S O_{4}$ (4) $N_{2} O_{5} + H_{2} O \to 2 H N O_{3}$ 17. $The industrial activity held least responsible for global warming is :$ (1) $manufacturing of cement$ (2) $steel manufacturing$ (3) $Electricity generation in thermal power plants$ (4) $Industrial production of urea$ 18. $Given below are two statements: Statement-I: The gas liberated on warming a salt with dil H_{2} SO_{4}, turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion. Statement-II: In statement-I the colour of paper turns black because of formation of lead sulphite. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Both Statement-I and Statement-II are false$ (2) $Statement-I is false but Statement-II is true$ (3) $Statement-I is true but Statement-II is false$ (4) $Both Statement-I and Statement-II are true.$ 19. $When a salt is treated with sodium hydroxide solution it gives gas X . On passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are$ (1) $X = NH_{3} and Y = HgO$ (2) $X = NH_{4} Cl and Y = KOH$ (3) $X = NH_{3} and Y = K_{2} HgI_{4} + KOH$ (4) $X = HCl and Y = NH_{4} Cl$ 20. $Given below are two statements: Statement I: Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green. Statement II : The green colour observed is due to the formation of copper(I) metaborate. In the light of the above statements, choose the most appropriate answer from the options given below :$ (1) $Both Statement I and Statement II are true$ (2) $Statement I is true but Statement II is false$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is false but Statement II is true$ 21. $Choose the correct tests with respective observations. (pc) (A) CuSO_{4} (acidified with acetic acid) + K_{4} (Fe (CN)_{6}) \to Chocolate brown precipitate.(B) FeCl_{3} + K_{4} (Fe (CN)_{6}) \to Prussian blue precipitate.(C) ZnCl_{2} + K_{4} (Fe (CN)_{6}), neutralised with NH_{4} OH \to White or bluish white precipitate.(D) MgCl_{2} + K_{4} (Fe (CN)_{6}) \to Blue precipitate.(E) BaCl_{2} + K_{4} (Fe (CN)_{6}), neutralised with NaOH \to White precipitate. Choose the correct answer from the options given below:$ (1) $A, D and E only$ (2) $A, B and C only$ (3) $B, D and E only$ (4) $C, D and E only$ 22. $Correct statement about smog is$ (1) $N O_{2} is present in classical smog$ (2) $Both N O_{2} and S O_{2} are present in classical smog$ (3) $Photochemical smog has high concentration of oxidizing agents$ (4) $Classical smog also has high concentration of oxidizing agents$ 23. $The compound that is white in color is$ (1) $ammonium sulphide$ (2) $lead sulphate$ (3) $lead iodide$ (4) $ammonium arsinomolybdate$ 24. $In Dumas' method for estimation of nitrogen 1 g of an organic compound gave 150 mL of nitrogen collected at 300 K temperature and 900 mm Hg pressure. The percentage composition of nitrogen in the compound is % (nearest integer) (Aqueous tension at 300 K = 15 mm Hg)$ 25. $The number of white coloured salts among the following is (A) SrSO_{4} (B) Mg (NH_{4}) PO_{4} (c) BaCrO_{4} (D) Mn (OH)_{2} (E) PbSO_{4} (F) PbCrO_{4} (G) AgBr (H) PbI_{2} (I) CaC_{2} O_{4} (J) (Fe (OH)_{2} (CH_{3} COO))$ 26. $The oxidation number of iron in the compound formed during brown ring test for NO_{3}^{-} ion is_______$ 27. $Number of metal ions characterized by flame test among the following is __________Sr^{2 +}, Ba^{2 +}, Ca^{2 +}, Cu^{2 +}, Zn^{2 +}, Co^{2 +}, Fe^{2 +}$ 28. $In Dumas' method 292 mg of an organic compound released 50 mL of nitrogen gas (N_{2}) at 300 K temperature and 715 mm Hg pressure. The percentage composition of ' N' in the organic compound is % (Nearest integer) (Aqueous tension at 300 K = 15 mmHg)$ 29. $Molar mass of the salt from NaBr, NaNO_{3}, KI and CaF_{2} which does not evolve coloured vapours on heating with concentrated H_{2} SO_{4} is _______gmol^{- 1}, (Molar mass in gmol^{- 1} : Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40$ 30. $0.1 mol of the following given antiviral compound (P) will weigh \times 10^{- 1} g (nearest integer). (Given: molar mass in gmol^{- 1} H : 1, C : 12, N : 14, O : 16, F : 19, I : 127)$