Tiêu đề Salt Analysis.pdf ✅

1 JEE Advanced (2024) Salt Analysis CHEMISTRY Only One Option Correct Type Question (1-7) 1. In the scheme given below, X and Y, respectively, are Metal halide ⎯⎯⎯⎯→ aq. NaOH White precipitate (P) + Filtrate (Q) ( ) 2 4 2 aq. H SO PbO excess heat P⎯⎯⎯⎯⎯⎯→ X (a coloured species in solution) Conc. H SO 2 4 warm Q⎯⎯⎯⎯⎯⎯→ Y (gives blue-colouration with KI-starch paper) [Confirmatory Test] (A) CrO4 2– and Br2 (B) MnO4 2– and Cl2 (C) MnO4 – and Cl2 (D) MnSO4 and HOCl 2. The reaction of Pb(NO3)2 and NaCl in water produces a precipitate that dissolves upon the addition of HCl of appropriate concentration. The dissolution of the precipitate is due to the formation of [Qualitative analysis] (A) PbCl2 (B) PbCl4 (C) [PbCl4] 2– (D) [PbCl6] 2– 3. Unknown salt ‘A’ + K2Cr2O7 + conc. H2SO4 → Reddish brown fumes. Which is the correct statement regarding the above observation. [Acid radical test] (A) It confirms the presence of Cl– ion (B) It confirms the presence of Br– ion (C) It confirms the presence of both (D) It neither confirms Cl– nor Br– unless it is passed through NaOH solution 4. A pale green crystalline inorganic salt (A) dissolves freely in water. It gives a brown precipitate on addition of aqueous NaOH. The solution of (A) also gives a black precipitate on bubbling H2S in alkaline medium. An aqueous solution of the (A) decolorizes the pink colour of the permanganate solution. The metal in the salt solution is [Confirmatory test] (A) Copper (B) Aluminium (C) Lead (D) Iron 5. Three samples of the same salts are taken separately. Excess of NH4OH gives white precipitate with first sample. Second sample gives white precipitate with NaCl. Third sample gives black precipitate when H2S gas is passed through the solution. Possible salt is [Qualitative analysis] (A) AgNO3 (B) Pb(NO3)2 (C) Hg(NO3)2 (D) MnSO4 6. In the borax bead test of Co2+, the blue colour of bead is due to the formation of [Borax bead test] (A) B2O3 (B) Co3B2 (C) Co(BO2)2 (D) CoO 7. Mixture of two salts are not soluble in water but soluble in dilute HCl solution. Mixture can be [Qualitative analysis] (A) AgNO3 and KBr (B) BaCO3 and ZnS (C) FeCl3 and CaCO3 (D) Mn(NO3)2 and MgSO4 One Or More Than One Correct Type Question (8-12) 8. CO 2 3 and HCO 3 can be distinguished by [Acid radical] (A) Phenolphthalein (B) MgCl2 solution (C) HgCl2 solution (D) KCl solution 9. Which of the following aqueous solution of cation(s) give(s) white ppt. with NaOH and NH4OH solution and formed ppt. is/are further completely dissolved in one of the excess reagent. [Basic radicals] (A) Cd2+ (B) Cr3+ (C) Sn2+ (D) Bi3+ 10. Cu2+ and Cd2+ can be distinguished by which of the following reagent(s). (A) KCN (B) KI (excess) (C) H2S in dil. HCl medium (D) K4[Fe(CN)6] Practice Sheet

3 ANSWER KEY 1. (C) 2. (C) 3. (D) 4. (D) 5. (B) 6. (C) 7. (B) 8. (A, B, C) 9. (A, C) 10. (A, B, C, D) 11. (A, B) 12. (A, B, C) 13. (3) 14. (2) 15. (3) 16. (B) 17. (A)