Salt Analysis and Qualitative Analysis Exercise # 1

SALT ANALYSIS AND QUALITATIVE ANALYSIS Exercise # 1 [Single Correct Choice Type Questions] 1. Zinc pieces are added to acidified solution of SO32 – . Gas liberated can : (A) turn lead acetate paper black (B) turn lime water milky (C) give white precipitate with AgNO3 solution (D) decolourize acidified KMnO4 solution 2. A mixture when rubbed with dilute acid smells like vinegar. It contains : (A) sulphite (B) nitrate (C) nitrite (D) acetate 3. A substance on treatment with dilute H2SO4 liberates a colourless gas which produces (i) turbidity with baryta water and (ii) turns acidified dichromate solution green. The reaction indicates the presence of : (A) CO32– (B) S2– (C) SO32– (D) NO2– 4. The carbonate of which of the following cation is soluble in water ? (A) Na+ (B) K+ (C) NH4+ (D) Ca2+ 5.. SO2 and CO2 both turn lime water (X) milky, SO2 also turns K2Cr2O7 /H+ (Y) green while O2 is soluble in pyrogallol (Z) turning it black. These gases are to be detected in order by using these reagents. The order is: (A) (X), (Y), (Z) (B) (Y), (X), (Z) (C) (X), (Z), (Y) (D) The correct order cannot be predicted. 6. Colourless salt (A) + dil. H2SO4 or CH3COOH + Kl  blue colour with starch. (A) can be (A) K2SO3 (B) Na2CO3 (C) NH4NO2 (D) NH4Cl 7. Which of the following combines with Fe() ions to form a brown complex? (A) N2O (B) NO (C) N2 O3 (D) N2O4 8. Which of the following statements is/are incorrect ? (A) A filter paper moistened with cadmium acetate solution turns yellow, when brought in contact with H2S gas. (B) Both carbonate ions as well as bicarbonate ions in the solutions, give reddish-brown precipitate with mercury(II) chloride. (C) Sulphites in presence of zinc, reacts with dilute H2SO4 to liberate SO3 gas. (D) A filter paper moistened with KIO3 and starch turns blue in contact with SO2 vapours. 9. A mixture upon adding conc. H2SO4 gives deep red fumes. It may contain the anions pair : (A) Cr2O72 – and Cl– (B) Br – and Cr2O72 – (C) NO3– and Cl – (D) CrO42 – and NO32 – 10. A solution of a salt in concentrated sulphuric acid H2SO4 acid produced a deep blue colour with starch iodide solution. The salt may be (A) chloride (B) carbonate (C) acetate (D) bromide 11. A colourless solution of a compound gives a precipitate with AgNO3 solution but no precipitate with a solution of Na2CO3 . The action of concentrated H2SO4 on the compound liberates a suffocating reddish brown gas. The compound is : (A) Ba(CH3COO)2 (B) CaCl2 (C) NaI (D) NaBr 12. Which of the following reagents turns white precipitate of AgCl yellow ? (A) NaNO3 (B) Na3AsO3 (C) Na3AsO4 13. (D) NaCN When a mixture of solid NaCl and solid K2Cr2O7 is heated with concentrated H2SO4, deep red vapours are obtained. This is due to the formation of : (A) chromous chloride (B) chromyl chloride (C) chromic chloride (D) chromic sulphate 14. AgCl dissolves in ammonia solution giving : (A) Ag+, NH4+ and Cl– (B) Ag(NH3)+ and Cl– (C) Ag2(NH3)2+ and Cl– (D) Ag(NH3)2+ and Cl– 15. Nitrate is confirmed by ring test. The brown colour of the ring is due to formation of : (A) ferrous nitrite (B) nitroso ferrous sulphate (C) ferrous nitrate (D) FeSO4 .NO2 . 16. Nitrates of all the metals except mercury and bismuth are : (A) coloured (B) unstable (C) soluble in water (D) insoluble in water 17. Which of the following reagents can be used for making the distinction between AgCl and AgI ? (A) Sodium arsenite solution. (B) Dilute ammonia solution. (C) Potassium cyanide solution. (D) Dilute HNO3. 18. When chlorine (Cl2) water in excess is added to a salt solution containing chloroform, chloroform layer turns pale yellow. Salt contains : (A) Br– (B) – (C) NO3– (D) S2– 19. An aqueous solution of salt containing an acidic radical X– reacts with sodium hypochlorite in neutral medium. The gas evolved produces blue black colour spot on the starch paper. The anion X– is : (A) CH3COO– (B) Br– (C) I– (D) NO2– 20. When chlorine water is added to an aqueous solution of potassium halide in the presence of chloroform, a colour is developed but on adding more of chlorine water the colour disappears, and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution. (A) Iodide (B) Bromide (C) Chloride (D) Iodide and bromide 21. Precipitate of PbSO4 is soluble in : (A) ammonium acetate (6M) (B) dilute HCl (C) dilute H2SO4 (D) none 22. There are four test tubes containing dilute HCl, BaCl2, CdCl2 and KNO3 solutions. Which of the following reagents will help in the identification of BaCl2 ? (A) NaOH 23. 24. 25. (B) K2CrO4 (C) AgNO3 (D) both (B) and (C) Ammonia/ammonium ion gives yellow precipitate with : (A) H2PtCl6 (B) HgCl2 (C) Na3[Co(NO2)6] (D) (A) and (C) both Nessler’s reagent is : (A) K2 Hg4 (D) K2 Hg4 + K (B) K2 Hg4 + KOH (C) K2Hg 2 + KOH Ammonium salts on heating with slaked lime liberates a colourless gas (X). Identify the correct statement for gas (X). (A) (X) turns red litmus blue and produces dense white fumes in contact with dilute HCl. (B) (X) turns filter paper moistened with mercurous nitrate black and gives intense blue coloured solution with CuSO4(aq). (C) (X) when passed through Nessler's reagent produces a brown colour precipitate. (D) All of these. 26. Cu2+ and Ag+ are both present in the same solution . To precipitate one of the ions and leaves the other in solution, add (A) H2S (aq) (B) HCl (aq) (C) HNO3(aq) (D) NH4NO3(aq) SALT ANALYSIS AND QUALITATIVE ANALYSIS 27. Consider the following observation : 2–  CrO 4 Mn+ + HCl (dilute)  white precipitate  water soluble    yellow precipitate. The metal ion Mn+ will be : (A) Hg2+ (B) Ag+ (C) Pb2+ (D) Sn2+ 28. A white crystalline substance dissolves in water. On passing H2S in this solution, a black precipitate is obtained. The black precipitate dissolves completely in hot HNO3. On adding a few drops of concentrated H2SO4 , a white precipitate is obtained. This precipitate is that of (A) BaSO4 (B) SrSO4 (C) PbSO4 (D) CdSO4 29. A metal nitrate reacts with KI solution to give yellow precipitate which on addition of excess of more concentrated solution (6 M) of KI dissolves forming a solution. The cation of metal nitrate is : (A) Hg22+ (B) Ag+ (C) Pb2+ (D) Cu2+ 30. Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dilute NaCl solution and one formed a black precipitate with H2S. The salt could be : (A) AgNO3 (B) Pb(NO3)2 (C) Hg(NO3)2 (D) Mn(NO3)2 31. White precipitate of silver chloride is soluble in : (A) KCN solution (excess) (C) ammonia solution (B) sodium thiosulphate solution (excess) (D) concentrated solution of KCl 32. In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are soluble in excess KI solution ? (A) HgI2 , Hg2I2 (B) HgI2 , BiI3 (C) Cu2I2 , AgI (D) CdI2 , PbI2 33. Which one of the following salts will produce clear and transparent original solution in 2M HCl ? (A) Ag2CO3 (B) Pb(CO3)2 (C) Hg2CO3 (D) CuCO3 34. A metal chloride original solution (i.e. O.S) on mixing with K2CrO4 solution gives a yellow precipitate soluble in aqueous sodium hydroxide. The metal may be : (A) mercury (B) iron (C) silver (D) lead 35. Sometimes yellow turbidity appears while passing H2S gas even in slightly acidic medium in the absence of  group radicals. This is because : (A) sulphur is present in the mixture as impurity. (B) IV group radicals are precipitated as sulphides. (C) of the oxidation of H2S gas by some acid radicals. (D)  group radicals are precipitated as hydroxides. 36. H2S in the presence of HCl precipitates  group but not V group because : (A) HCl activates H2S (B) HCl increases concentration of Cl– (C) HCl decreases concentration of S2– (D) HCl lowers the solubility of H2S in solution 37. Yellow ammonium sulphide solution is a suitable reagent for the separation of : (A) HgS and PbS (B) PbS and Bi2 S3 (C) Bi2 S3 and CuS (D) CdS and As2 S3 Which of the following is insoluble in dil. HNO3 but dissolves in aqua regia ? (A) HgS (B) PbS (C) Bi2 S3 (D) CuS. 38. 39. When small amount of SnCl2 is added to a solution of Hg2+ ions, a silky white precipitate is obtained. The silky white precipitate is due to the formation of : (A) Hg2Cl2 (B) SnCl4 (C) Sn (D) Hg 40. Which of the following reagents gives white precipitate with Hg(NO3)2 solution ? (A) Cobalt (II) thiocyanate (B) Tin (II) chloride (excess) (C) Ammonia solution (D) Potassium cyanide solution 41. When bismuth chloride is poured into a large volume of water the white precipitate produced is of : (A) BiO.OH (B) Bi2 O3 Which of the following is/are correctly matched ? (C) BiOCl 42. (A) BiI3   Black (B) Cu2I2   White precipitate (C) PbI2   Yellow precipitate (D) HgI2   Red precipitate (D) Bi (OH)3 43. When excess of dilute NH4OH is added to an aqueous solution of copper sulphate an intense blue colour is developed. This is due to the formation of : (A) [Cu(NH3)6]2+ (B) Cu(OH)2 (C) [Cu(NH3)4]2+ (D) (NH4)2SO4 44. A black sulphide is formed by the action of H2S on : (A) cupric chloride (B) cadmium chloride (C) zinc chloride (D) ferric chloride. 45. Cu2+ ions will be reduced to Cu+ ions by the addition of an aqueous solution of : (A) KI (B) KCl (C) KSCN (D) KCN 46. Turnbull’s blue is a .................... . (A) ferricyanide (C) ferrous cyanide 47. 48. 49. (B) ferrous ferricyanide (D) ferri ferrocyanide Fe(OH)3 and Cr(OH)3 precipitates can be completely separated by : (A) Aq. NH3 (B) HCl (C) NaOH/H2O2 (D) H2SO4 Ferric alum gives deep red colour with NH4SCN due to the formation of : (A) Al(SCN)3 (B) [Fe(SCN)3]– (C) Fe(SCN)3 (D) None of these. When NH4Cl is added to a solution of NH4OH : (A) the dissociation of NH4OH increases. (C) the concentrations of both OH– an NH4+ increase. (B) the concentration of OH– increases. (D) the concentration of OH– ion decreases. 50. An original solution of an inorganic salt in dilute HCl gives a brown colouration with potassium hexacyanidoferrate (III) and reddish brown colouration with sodium acetate solution. The cation of the salt is : (A) Ni2+ (B) Fe3+ (C) Cu2+ (D) none 51. Intense blue precipitate of Fe4[Fe(CN)6]3 and potassium hydroxide solution when mixed gives : (A) K2Fe[Fe(CN)6] - white precipitate (B) Fe(OH)3 - reddish–brown precipitate (C) Fe(CN)3 – reddish–brown precipitate (D) KFe[Fe(CN)6] - Turnbull's blue 52. NH4SCN can be used to test one or more out of Fe3+ , Co2+ ,Cu2+ : (A) Fe3+ only (B) Co2+ , Cu2+ only (C) Fe3+ Cu2+ only (D) All 53. K4[Fe(CN)6] can be used to detect one or more out of Fe2+ , Fe3+, Zn2+, Cu2+, Ag+ , Ca2+ : (A) only Fe2+, Fe3+ (B) only Fe3+,Zn2+,Cu2+ (C) all but not Ca2+ (D) all of these. 54. An aqueous solution of colourless metal sulphate M, gives a white precipitate with NH4OH. This was soluble in excess of NH4OH. On passing H2S through this solution a white precipitate is formed. The metal M in the salt is: (A) Ca (B) Ba (C) Al (D) Zn SALT ANALYSIS AND QUALITATIVE ANALYSIS 55. 56. Which one of the following ions does not give borax bead test ? (A) Cr3+ (B) Cu2+ (C) Mn2+ (D) Zn2+ Which of the following compound is formed in borax bead test ? (A) Orthoborate (B) Metaborate (C) Double oxide (D) Tetraborate 57. To increase significantly the concentration of free Zn2+ ion in a solution of the complex ion [Zn(NH3)4]2+ Zn2+ (aq) + 4NH 3 (aq) [Zn(NH3)4]2+ (aq) add to the solution some : (A) H2O (B) HCl (aq) (C) NH3(aq) (D) NH4Cl (aq) 58. CoS (black) obtained in group IV of salt analysis is dissolved in aqua regia and is treated with an excess of NaHCO3 and then Br2 water. An apple green coloured stable complex is formed. It is : (A) sodium cobaltocarbonate (B) sodium cobaltibromide (C) sodium cobalticarbonate (D) sodium cobaltobromide 59. A metal salt solution when treated with dimethyl glyoxime and NH4OH gives a rose red complex. The metal is (A) Ni (B) Zn (C) Co (D) Mn. 60. White precipitate of Zn(OH)2 dissolves in : (A) sodium hydroxide solution (C) ammonia solution (B) acid solution (D) solution of ammonium salts 61. If crimson flame is given when an inorganic mixture is tested by flame test, it may be due to the presence of (A) potassium (B) strontium (C) barium (D) calcium 62. A brick red colour is imparted to Bunsen flame by a : (A) Ca salt (B) Sr salt (C) Na salt (D) Co salt 63. The presence of magnesium is confirmed in the qualitative analysis by : (A) titan yellow solution + 2M NaOH solution (B) disodium hydrogen phosphate +NH4Cl + NH3 (aq.) (C) magneson(I) reagent (D) all of these 64. Aqueous Solution of BaBr2 gives yellow precipitate with : (A) K2CrO4 (B) AgNO3 (C) (CH3COO)2Pb (D) (A) and (B) both 65. The addition of K2CO3 (aq) to the following solution is expected to produce a precipitate in every case but that one which does not produce precipitate is : (A) BaCl2(aq) (B) CaBr2(aq) (C) Na2SO4(aq) (D) Pb(NO3)2 (aq) 66. An aqueous solution of salt gives white precipitate with AgNO3 solution as well as with dilute H2SO4. It may be (A) Pb(NO3)2 (B) Ba(NO3)2 (C) BaCl2 (D) CuCl2 67. Which of the following solutions give white precipitate with Pb(NO3)2 as well as with Ba(NO3)2 ? (A) Sodium chloride (B) Sodium sulphate (C) Disodium hydrogen phosphate (D) Sodium chromate 68. Mg is not precipitated in V group because : (A) MgCO3 is soluble in water. (C) MgCO3 is soluble in NH4OH. 69. (B) Ksp of MgCO3 is high. (D) None. An aqueous solution of compound 'A' gives white precipitate with 2M HCl. The precipitate becomes black on addition of aqueous NH3 due to formation of ‘B’. ‘B’ dissolves in aquaregia. ‘A’ and ‘B’ are : (A) Hg2+ and Hg Cl2 (B) Hg22+ and Hg2 Cl2 2+ (C) Hg and Hg (NH2) Cl + Hg (D) Hg22+ and Hg (NH2) Cl + Hg 70. A compound (X) reacts in the following ways. (X)(aq) KI(aq) Bright yellow precipitate BaCl2 (aq) NaOH(aq) Brown/Black precipitate The compound (X) is likely to be (A) Pb(NO3)2 (B) CaCrO4 71. White precipitate NH3 (aq) Colourless solution (C) Hg(NO3)2 (D) AgNO3 To a solution of a substance, gradual addition of ammonium hydroxide results in a brownish black precipitate which does not dissolve in excess of NH4OH. However, when KI (not in excess) is added to the original solution, a green precipitate is formed. The solution contained : (A) Lead salt (B) Silver salt (C) Mercurous salt (D) Copper salt. 72. The gas ‘G’ will show which of the following property ? (A) It turns lead acetate filter paper black. (B) It turns acidified K2Cr2O7 filter paper green. (C) It produces purple colouration on filter paper moistened with sodium nitroprusside already made alkaline with sodium hydroxide. (D) All of these 73. Consider following reaction ; Nitrite + Acetic acid + Thiourea  N2 + SCN– + 2H2O. Formation of the product in the above reaction can be identified by : (A) FeCl3 / dilute HCl, when blood red colour appears. (B) FeCl3 / dilute HCl, when blue colour appears. (C) K2Cr2O7 / HCl, when green colour appear. (D) KMnO4 / HCl, when colourless solution is formed. 74. White precipitate of AgCl turns to greyish or black when : (A) reacts with Na3AsO4 (B) exposed to sunlight (C) reacts with K2CrO4 (D) reacts with concentrated HCl 75. Black precipitate of copper sulphide dissolves in : (A) KCN solution. (C) sodium hydroxide. 76. (B) sodium sulphide solution. (D) boiling dilute (M) sulphuric acid. Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold) ? (A) Ni (B) Fe (C) Cu (D) Mn SALT ANALYSIS AND QUALITATIVE ANALYSIS 77. Which one among the following pairs of ions cannot be separated by H2S in dilute hydrochloric acid ? (A) Bi3+, Sn4+ (B) Al3+, Hg2+ (C) Zn2+, Cu2+ (D) Ni2+, Cu2+ 78. Which one of the following metal salts produces a blue coloured bead in cobalt nitrate charcoal cavity test ? (A) Zn2+ (B) Mg2+ (C) Sn2+ (D) Al3+ 79. Which of the following is correct ? (A) AgCl(s) + Na3 AsO3  colourless solution (C) FeCl3(aq) + K3Fe(CN)6  brown colouration. (B) FeCl3(aq) + K4 Fe(CN)6  brown precipitate. (D) CuSO4(aq) + KCN (excess)  blue colouration. 80. Fe2+ does not give prussian blue colour with K4[Fe(CN)6] but on its reaction with (X), prussian blue colour appears (X) can be : (A) MnO4–/ H+ (B) Zn/NaOH (C) NH3 (aq) (D) all true 81. The reagents, NH4Cl and aqueous NH3 will precipitate : (A) Ca2+ (B) Al3+ (C) Mg2+ (D) Zn2+ . 82. In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to : (A) decrease concentration of OH– ions (B) prevent interference by phosphate ions (C) increase concentration of Cl– ions (D) increase concentration of NH4+ ions 83. Which one of the following can be used in place of NH4Cl for the identification of the third group radicals? (A) NH4NO3 (B) (NH4)2SO4 (C) (NH4)2CO3 (D) NaCl. 84. When HNO3 is added to sodium ferrocyanide, which of the following observation is observed ? (A) NaFe[Fe(CN)6] is produced. (B) Fe4[Fe(CN)6]3 is formed. (C) Fe3[Fe(CN)6]2 is formed. (D) Na2[Fe(CN)5(NO)+]2– is formed. 85. What product is formed by mixing the solution of K4 [Fe(CN)6] with the solution of FeCl2 in complete absence of air ? (A) Ferro ferricyanide (B) Ferric ferrocyanide (C) Ferric ferricyanide (D) None 86. Select the correct statement with respect to Fe3+ ions. (A) Iron (III) ions react with H2S in acidic solution to give a black precipitate of Fe2S3. (B) Iron (III) ions react with ammonium sulphide to give the black precipitate of Fe 2S3. (C) Iron (III) ions react with ammonium thiocyanate solution to produce deep red colouration. (D) All of these 87. A suspension containing insoluble substances ZnS, MnS, HgS, Ag2S and FeS, is treated with 2N HCl. On filtering, the filtrate contains appreciable amounts of which one of the following? (A) Zinc and mercury (B) Silver and iron (C) Manganese and mercury (D) Zinc, manganese and iron 88. An aqueous solution contains both Al3+ & Zn2+.To this solution NH4OH is added in excess. (A) Only Al(OH)3 will be precipitated. (B) Only Zn(OH)2 will be precipitated. (C) Both will be precipitated. (D) No precipitate will appear. 89. A metal M and its compound can give the following observable changes in a sequence of reactions, Colourless solution  aqueous very dilute     M HNO  3 and no gas is evolved  NaOH The metal M can be : (A) Mg (B) Pb  White  excess  precipitate  NaOH(aq.)   (C) Zn Colourless  H S /OH –  White  2  solution       precipitate  (D) Sn 90. Which one of the following compounds on reaction with Na2O2 in alkaline medium gives yellow colour solution? (A) Cr (OH)3 (B) Zn(OH)2 (C) Al(OH)3 (D) None of these. 91. A dark green bead in the borax bead test (in oxidising flame) indicates the presence of : (A) Cr3+ (B) Mn2+ (C) Co2+ (D) Ni2+ 92. Which of the following cation does not give red colour precipitate/solution with dimethylglyoxime (DMG) in alkaline solution ? (A) Zn+2 (B) Ni+2 (C) Fe2+ (D) both (A) and (C) 93. In fifth group, (NH4)2CO3 is added to precipitate out the carbonates. We do not add Na2CO3 because : (A) CaCO3 is soluble in Na2CO3 (B) Na2CO3 increases the solubility of fifth group carbonates (C) MgCO3 will be precipitated out in fifth group (D) none 94. A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dilute sulphuric acid, but gives no precipitate with sodium chloride or iodide, it is : (A) lead carbonate (B) basic lead carbonate (C) barium carbonate (D) strontium carbonate 95. An inorganic salt when heated with concentrated H2SO4 evolves a colourless pungent smelling gas but with concentrated H2SO4 and MnO2 evolves a coloured pungent smelling gas which bleaches moist litmus paper. The coloured gas is : (A) NO2 (B) Cl2 (C) Br2 (D) I2 96. Chromyl chloride vapours are dissolved in water and acetic acid and barium acetate solution is added, then: (A) the solution will remain colourless. (B) the solution will become dark green. (C) a yellow solution will be obtained. (D) a yellow precipitate will be obtained. 97. When CS2 layer containing both Br2 and I2 (2 : 1) is shaken with excess of chlorine (Cl2) water, the violet colour due to I2 disappears and a pale yellow colour appears in the solution. The disappearance of violet colour and appearance of pale yellow colour is due to the formation of : (A) I3– and Br2 respectively. (B) HIO3 and BrCl respectively. (C) ICl and BrCl respectively. (D) I– and Br– respectively. 98. When a salt is heated with dilute H2SO4 and KMnO4 solution, the pink colour of KMnO4 is discharged, the salt is : (A) a sulphite (B) a carbonate (C) a nitrate (D) a bicarbonate 99. Solution of a salt in dilute H2SO4 or acetic acid produces deep blue colour with starch iodide solution. The salt contains : (A) Br– (B) I– (C) NO3– (D) NO2– 100. A test tube containing a nitrate and another containing a bromide and MnO2 are treated with concentrated H2SO4. The reddish brown fumes evolved are passed through water. The water will be coloured by : (A) the nitrate (B) the bromide (C) both (D) none of the two 101. A metal salt solution gives a yellow precipitate with silver nitrate. The precipitate dissolves in dilute nitric acid as well as in dilute ammonia solution. The solution contains : (A) bromide ions (B) iodide ions (C) phosphate ions (D) chromate ions 102. Which of the following will not give positive chromyl chloride test ? (A) Copper chloride, CuCl2. (B) Mercuric chloride, HgCl2. (C) Zinc chloride, ZnCl2. (D) Anilinium chloride C6H5NH3Cl. SALT ANALYSIS AND QUALITATIVE ANALYSIS 103. A white sodium salt dissolves in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dilute HNO 3. The anion is (A) CO32– (B) Cl– (C) SO32– (D) S2– 104. The composition of golden spangles is : (A) PbCrO4 (B) PbI2 105. (C) As2S3 In which of the following solvents, AgBr will have the highest solubility ? (A) 10–3 M NaBr (B) 10–3 M NH4OH (C) Pure water (D) BaCrO4 (D) 10–3 M HBr 106. A metal nitrate solution reacts with dilute hydrochloric acid to give a white precipitate which is soluble in concentrated potassium chloride. White precipitate on passing of hydrogen sulphide gas is converted into black precipitate. The black precipitate on boiling with hydrogen peroxide (3%) is converted again to a white precipitate which is soluble in ammonium acetate. The cation of the metal nitrate is : (A) Pb2+ (B) Ag+ (C) Hg2+ (D) Bi3+ 107. A one litre flask is full of reddish brown bromine fumes. The intensity of brown colour of vapour will not decrease appreciably on adding to the flask some : (A) pieces of marble (B) animal charcoal powder (C) carbon tetrachloride (D) carbondisulphide 108. Identify the compound which turns black with ammonia solution. (A) Lead chloride (B) Mercurous chloride (C) Mercuric chloride (D) Silver chloride 109. A white crystalline substance dissolves in water. On passing H2S in this solution, a black precipitate is obtained. The black precipitate dissolves completely in hot HNO3. On adding a few drops of concentrated H2SO4, a white precipitate is obtained which is soluble in ammonium acetate. The white precipitate is that of: (A) BaSO4 (B) SrSO4 (C) PbSO4 (D) Ag2SO4 110. A metal nitrate solution does not give white precipitate with concentrated hydrochloric acid but on dilution with water produces a white precipitate. The metal nitrate solution with K2CrO4 and Na2HPO4 reagents gives red and yellow precipitates respectively which are soluble in ammonia solution. The cation of the metal nitrate is : (A) Pb2+ (B) Ag+ (C) Cu2+ (D) Bi3+ 111. Which of the following pairs comprises the red precipitates ? (A) Ag2CrO4 and Hg2CrO4 (B) HgI2 and Pb2SCl2 (C) BiOI and Cu2[Fe(CN)6] (D) (A) and (B) both 112. Which one among the following pairs of ions can not be separated by H2S in presence of dilute hydrochloric acid? (A) Cd2+, Sn2+ (B) Al3+, Hg2+ (C) Zn2+, Cu2+ (D) Ni2+, Bi3+ 113. Which of the following reagents gives a yellow precipitate with a hot faintly acidic solution of Bi 3+ ions ? (A) Ammonia solution (excess). (B) Freshly prepared 10% solution of pyrogallol. (C) Potassium iodide solution. (D) Freshly prepared 0.125 M alkaline sodium tetrahydroxidostannate (II) solution. 114. Select the incorrect statement. (A) Marsh's test involves the reduction of soluble arsenic compound to arsine by nascent hydrogen in acidic solution and its subsequent decomposition into hydrogen and metallic arsenic as a brownish-black mirror on heating in a glass tube mixed with hydrogen. (B) Ammonical silver nitrate gives metallic silver mirror with saturated solution of hydrazine sulphate. (C) Red precipitate of silver (I) chromate is soluble in dilute nitric acid and ammonia solution. (D) None of these 115. Which one of the following cations will give a green coloured ash when a piece of filter paper dipped in a solution containing its salt and Co(NO3)2 is burned ? (A) Cu2+ (B) Mg2+ (C) Al3+ (D) Zn2+ 116. Which of the following is not precipitated as sulphide by passing H2S in the presence of concentrated HCl ? (A) Copper (B) Arsenic (C) Cadmium (D) Lead 117. Which of the following metal cation is reduced from its higher oxidation state (+2) to (+1) by both KI solution and excess of KCN solution ? (A) Zn2+ (B) Hg2+ (C) Cu2+ (D) None 118. A coloured solution of an inorganic salt reacts with potassium thiocyanate to give first a black precipitate, which slowly turns white. The salt solution also gives black precipitate with H2S gas in slightly acidic medium. The black precipitate dissolves in potassium cyanide forming a colourless solution. The basic radical present in the inorganic salt is : (A) Bi3+ (B) Cu2+ (C) Hg2+ (D) None 119. To avoid the precipitation of hydroxides of Ni2+, Co2+, Mn2+ along with those of the third group cations, the solutions should be : (A) heated with few drops of concentrated HNO3. (B) boiled with excess of ammonium chloride. (C) concentrated to small volume. (D) none of these. 120. A solution containing SCN– ions can be used to test one or more out of : Fe3+, Co2+ , Cu2+, Ag+ and Hg2+. (A) Fe3+ and Co2+ only (B) Co2+, Cu2+, Ag+ and Hg2+ (C) Fe3+ , Cu2+, Co2+ and Hg2+ (D) all 121. A blue colouration (in solution or precipitate) is not obtained when : (A) ammonium hydroxide dissolves in copper sulphate. (B) cobalt chloride reacts with NH4SCN in presence of amyl alcohol. (C) ferric chloride reacts with sodium ferrocyanide. (D) aqueous ammonia reacts with white precipitate of silver (I) chloride. 122. ether CrO42– + H+ + H2O2   X + H2O Identify the correct statement with respect to X. (A) It is an acid anhydride of chromic acid. (B) It is a red colour compound which can be extracted easily into the etherial phase. (C) It is chromium peroxide which produces blue colouration in etherial layer on gentle shaking. (D) It is Cr2O3 which is used as a green pigment. 123. In the fourth group, white precipitate of Mn(OH)2 on heating with PbO2 and concentrated HNO3 gives red-violet (purple) colour due to the formation of : (A) HMnO4 (B) Mn2O7 (C) MnO(OH)2 (D) PbMnO4 124. A coloured solution of a salt gives following reactions. (i) It gives white precipitate with sodium hydroxide which becomes brown on exposure to air. (ii) It gives white precipitate with ammonia solution which is soluble in ammonium salts. (iii) Its acidified solution containing a few drops of dilute AgNO3 on boiling with ammonium peroxodisulphate gives a reddish violet solution. The cation of the salt is : (A) Mn2+ (B) Zn2+ (C) Al3+ (D) Ni2+ SALT ANALYSIS AND QUALITATIVE ANALYSIS 125. A mixture of chlorides of copper, cadmium, chromium, iron and aluminium was dissolved in water. It was acidified with dilute HCl and then hydrogen sulphide gas was passed for sufficient time. It was filtered, boiled and a few drops of nitric acid were added, while boiling. To this solution ammonium chloride and ammonium hydroxide were added. To this excess of sodium hydroxide was added and then filtered. The filtrate shall give test for : (A) sodium and iron (B) sodium, chromium and aluminium (C) aluminium and iron (D) sodium, iron, cadmium and aluminium 126. Which of the following compounds on reaction with NaOH and Na2O2 gives yellow colour solution? (A) Cr(OH)3 (B) Zn(OH)2 (C) Al(OH)3 (D) Fe(OH)3 127. FeCl3 + K3[Fe(CN)6] + H2O2  Precipitate. The colour of the precipitate is : (A) sky blue (B) brown (C) prussian blue 128. Zn(OH)2 is soluble in : (A) excess of sodium hydroxide (C) solutions of ammonium salts (D) white (B) excess of ammonia solution (D) all of these 129. Potassium chromate solution is added to an aqueous solution of a metal chloride. The yellow precipitate thus obtained is insoluble in acetic acid. The precipitate is subjected to flame test, the colour of the flame is: (A) lilac (B) apple green (C) crimson red (D) brick red 130. A mixture of two salts is not water soluble but dissolves completely in dilute HCl to form a colourless solution. The mixture could be : (A) AgNO3 and KBr (B) BaCO3 and ZnS (C) FeSO4 and Na2CO3 (D) Mn(NO3)2 and MgSO4 131. Select the correct statement with respect to Ca2+ ions. (A) K2CrO4 gives white precipitate in the presence of acetic acid. (B) Potassium hexacyanidoferrate (II) solution gives white precipitate. (C) It gives lilac colour in Bunsen flame. (D) Prolonged passage of carbon dioxide gas through its aqueous solution produces white precipitate.