1. Transition metals are generally
- Coloured & paramagnetic
- Coloured and diamagnetic
- Colourless and paramagnetic
- Colourless and diamagnetic
(a) Transition metals often have unpaired d-electrons causing paramagnetism and d-d transitions leading to color. 2. Transition metals are coloured due to
- Small size
- Metallic nature
- Unpaired d-electrons
- All
(c) d-d electron transitions between split d-orbitals absorb visible light, producing color. 3. Blister copper is
- Ore of Cu
- Alloy of Cu
- Pure Cu
- Cu containing 1% impurity
(d) Blister copper is 98-99% pure with SO2 bubbles giving blistered appearance. 4. Copper can be extracted from
- Kupfernical
- Dolomite
- Malachite
- Galena
(c) Malachite [CuCO3.Cu(OH)2] is an important copper ore. 5. Malachite is
- Cu2S
- CuFeS2
- CuCO3.Cu(OH)2
- CuCO3
(c) Malachite is a basic copper carbonate mineral. 6. Copper is manufactured from
- Chalcopyrite
- Galena
- Cuprite
- Sphalerite
(a) Chalcopyrite (CuFeS2) is the principal copper ore. 7. Copper pyrites are concentrated by
- Electromagnetic method
- Gravity method
- Froth floatation method
- All the above methods
(c) Froth floatation is used for sulfide ores like CuFeS2. 8. An extremely hot copper wire reacts with steam to give
(a) 2Cu + H2O → Cu2O + H2 (at moderate heat) → CuO at high temp. 9. When Cu reacts with AgNO3 solution, the reaction takes place is
- Oxidation of Cu
- Reduction of Cu
- Oxidation of Ag
- Reduction of NO3
(a) Cu + 2AgNO3 → Cu(NO3)2 + 2Ag (Cu is oxidized from 0 to +2). 10. Copper displaces which metal from their salt solutions
- AgNO3
- ZnSO4
- FeSO4
- All of the above
(a) Cu can displace less reactive metals (below it in reactivity series) like Ag. 11. Copper is extracted from low grade ore by
- Hydrometallurgy
- Electrometallurgy
- Pyrometallurgy
- All the above process
(a) Heap leaching (hydrometallurgy) is used for low-grade ores. 12. Which of the following metals will not react with solution of CuSO4?
(d) Ag is less reactive than Cu (cannot displace Cu from CuSO4). 13. Compound of blue colour is
- CuSO4
- CuSO4.5H2O
- PbSO4
- HgSO4
(b) Hydrated copper sulfate (CuSO4.5H2O) is blue. 14. Compound of anhydrous copper sulphate is
(c) Anhydrous CuSO4 is white (color comes from water coordination). 15. Anhydrous CuSO4 in laboratory is used to detect
- Traces of alcohol in water
- Traces of water in organic liquids
- Traces of alcohol in organic liquids
- None
(b) Anhydrous CuSO4 turns blue in presence of water. 16. Which of the following is an ore of silver?
- Argentite
- Stibnite
- Haematite
- Bauxite
(a) Argentite (Ag2S) is principal silver ore. 17. Silver is extracted from its
- Sulphide
- Oxide
- Nitrate
- Chloride
(a) Mainly from argentite (Ag2S) via cyanide process. 18. Horn silver is
(a) Horn silver = cerargyrite (AgCl). 19. Parke's process is used in the extraction of
(c) Parke's process removes silver from argentiferous lead. 20. Which of the following metal is obtained by leaching its ore with dilute cyanide solution?
- Silver
- Titanium
- Vanadium
- Zinc
(a) Ag forms soluble [Ag(CN)2]- complex during cyanide leaching. 21. Impurities of lead in silver is removed by
- Cyanide process
- Parke's process
- Solvay process
- Hoop's process
(b) Parke's process uses Zn to separate Ag from Pb. 22. Silver obtained from argentiferous lead is purified by
- Distillation
- Froth floatation
- Cupellation
- Reaction with KCN
(c) Cupellation oxidizes Pb to PbO, leaving pure Ag. 23. Silver gets tarnished in air due to reaction with
(d) Forms black Ag2S when exposed to atmospheric H2S. 24. Silver compound least soluble in water is
(a) Solubility order: AgF > AgCl > AgBr > AgI > Ag2S. 25. Zinc is mainly extracted from
- Calamine
- Zincite
- Zinc blende
- Cryolite
(c) Zinc blende (ZnS) is the most important ore. 26. Spelter is
- ZnO
- ZnCO3
- Impure Cu
- Impure Zinc
(d) Spelter = commercial impure zinc (~98%). 27. No. of unpaired electrons in Zn2+ is
(d) Zn2+ has d10 configuration (all paired). 28. Zn + Cold & very dil. HNO3 gives
- Zn(NO3)2 + N2O
- Zn(NO3)2 + NO
- Zn(NO3)2 + NH4NO3
- Zn(NO3)2 + NO2
(c) 4Zn + 10HNO3 (dil.) → 4Zn(NO3)2 + NH4NO3 + 3H2O 29. Which is called philosopher's wool?
(a) ZnO forms woolly tufts when Zn vapor burns in air. 30. Which is called Rinmann's green?
- Ferrous ferrocyanide
- Ferric ferricyanide
- Ferric ferrocyanide
- Complex of ZnO with CoO
(d) Rinmann's green = Co-doped ZnO (green pigment). 31. Zn + conc. H2SO4 →
- ZnO
- ZnSO4
- ZnCO3
- None of these
(b) Zn + 2H2SO4 → ZnSO4 + SO2 + 2H2O 32. White vitriol is
- CuSO4.5H2O
- ZnSO4.5H2O
- FeSO4.7H2O
- ZnSO4.7H2O
(d) White vitriol = ZnSO4.7H2O. 33. Lucas reagent is
- Anh. ZnCl2 + HCl (Conc)
- MnO2 + H2O
- H2SO4 + HCl
- NO + H2O
(a) Lucas reagent = ZnCl2 in conc. HCl (tests alcohol classification). 34. Metal used for galvanizing Iron sheets is
(a) Zn coating prevents rusting (sacrificial protection). 35. Cinnabar is an ore of
(a) Cinnabar = HgS (main mercury ore). 36. Mercurous ion is represented as
(c) Mercurous ion exists as dimer (Hg22+). 37. Molecular formula of corrosive sublimate is
(a) Corrosive sublimate = HgCl2 (toxic). - HgCl2
- Hg2Cl2
- Hg + HgCl2
- Hg2Cl2 & Hg
(b) Calomel = Mercurous chloride (Hg2Cl2). 39. Which is used as purgative in medicine?
- ZnCl2
- HgCl2
- Hg2Cl2
- ZnSO4.7H2O
(c) Calomel (Hg2Cl2) was historically used as laxative. 40. When excess SnCl2 is added to HgCl2, a white precipitate turning to grey is obtained. This grey colour is due to the formation of
(d) 2HgCl2 + SnCl2 → Hg2Cl2 (white) + SnCl4; Excess SnCl2 reduces Hg2Cl2 to Hg (grey). 41. Mercury sticks to the surface of glass when comes in contact with
(d) Grease prevents Hg from forming spherical droplets (increases adhesion). 42. Zinc becomes dull in moist air due to the formation of
- Zinc carbonate
- Basic zinc hydroxide
- Basic zinc carbonate
- Basic copper carbonate
(c) Forms ZnCO3.Zn(OH)2 (basic zinc carbonate) patina. 43. Zn on reacting with cold dil. HNO3, forms
(b) 4Zn + 10HNO3 (dil.) → 4Zn(NO3)2 + NH4NO3 + 3H2O 44. Which of the following is used in making ointment for curing skin diseases?
(a) ZnO has antiseptic and soothing properties. 45. Zinc does not show variable valency, because
- It is relatively soft metal
- Its d-subshell is complete
- Its d-subshell is incomplete
- It has two electrons in outermost shell
(b) Zn2+ has stable d10 configuration (no d-electron involvement). 46. Which of the following is formed, when H2S is passed through the solution of sodium zincate?
- ZnS
- Zn(OH)2
- Zn(NO3)2
- Na2[Zn(OH)4]
(a) Na2ZnO2 + H2S → ZnS↓ + 2NaOH 47. ZnO when heated with BaO at 1100°C gives
- BaZnO2
- Ba + ZnO2
- BaCdO2
- BaO2 + Zn
(a) Forms barium zincate (BaZnO2). 48. The roasted zinc oxide is converted into zinc by the process of
- Oxidation
- Reduction
- Galvanisation
- Concentration
(b) ZnO + C → Zn + CO (carbothermic reduction at 1200°C). 49. Which is not an ore of iron?
- Haematite
- Magnetite
- Cassiterite
- Limonite
(c) Cassiterite is SnO2 (tin ore). 50. Formula of haematite is
(d) Haematite = Fe2O3 (no water). 51. Brown haematite is
(c) Brown haematite (limonite) = hydrated Fe2O3. 52. Iron is extracted from
- Cryolite
- Bauxite
- Haematite
- Chalcopyrite
(c) Haematite (Fe2O3) is principal iron ore. 53. Purest form of Iron is
- Steel
- Wrought Iron
- Cast Iron
- Pig Iron
(b) Wrought iron: 99.5% Fe (lowest carbon content). 54. Iron rendered passive on treatment with
(c) Conc. HNO3 forms protective oxide layer. 55. Passivity of Iron is due to formation of
(a) Forms inert Fe2O3 layer. 56. Highest % of C is present in
- Cast iron
- Wrought iron
- Pig iron
- Passive iron
(c) Pig iron: 3-4% C > Cast iron: 2-3% > Steel: 0.1-1.5% > Wrought iron: 0.1%. 57. % of C in steel is
(c) Steel typically contains 0.2-1.5% carbon. 58. Iron reacts with carbon to form
(b) Cementite (Fe3C) forms in steel. 59. Steel contains
- Fe + C + Mn
- Fe + C + Al
- Fe + Ni + Mn
- Fe + Mn + Ni + Cr
(d) Alloy steels may contain Mn, Ni, Cr, etc. 60. Carbon percentage is highest in
- Mild steel
- Hard steel
- Alloy steel
- None
(b) Hard steel: 0.6-1.5% C > Mild steel: 0.1-0.5% C. 61. Steel becomes soft & pliable by
- Case hardening
- Tempering
- Nitriding
- Annealing
(d) Annealing relieves internal stresses, softens steel. 62. Nitriding is a process of surface hardening steel by treating it in an atmosphere of
(c) NH3 dissociates to form iron nitrides at surface. 63. If a steel article is heated to redness and then suddenly cooled by plunging into water or oil, it becomes
- Hard & ductile
- Soft & ductile
- Hard & brittle
- Soft & brittle
(c) Quenching increases hardness but causes brittleness. 64. Most stable oxidation state of Iron is
(c) Fe3+ is more stable than Fe2+ (half-filled d5 configuration). 65. Which metal corrodes easily in moist air?
(d) Iron rusts (forms hydrated oxides) in moist air. 66. Iron gets rust by the action of
- Air
- Air and H2O
- Air, water & CO2
- All
(b) Requires both O2 and H2O (CO2 accelerates but isn't essential). 67. Rust is
- FeO + Fe(OH)2
- Fe2O3 + Fe(OH)2
- Fe2O3
- Fe2O3 + Fe(OH)3
(d) Rust ≈ Fe2O3.xH2O (hydrated ferric oxide with some Fe(OH)3). 68. Rusting of iron is a chemical reaction. The reaction is
- Analysis
- Displacement
- Combination
- Decomposition
(c) 4Fe + 3O2 + xH2O → 2Fe2O3.xH2O (combination with O2). 69. Rusting of iron in moist air involves
- Loss of electrons by iron
- Gain of electrons by iron
- Neither gain nor loss electron
- Hydration of iron
(a) Anodic reaction: Fe → Fe2+ + 2e- (oxidation). 70. FeSO4.7H2O is known as
- Mohr's salt
- Green vitriol
- White vitriol
- None
(b) Green vitriol = Ferrous sulfate heptahydrate. 71. Mohr's salt is
- FeSO4.7H2O
- Fe(NH4)SO4.6H2O
- FeSO4.Al2(SO4)3.2H2O
- FeSO4.(NH4)2SO4.6H2O
(d) Mohr's salt = Ferrous ammonium sulfate hexahydrate. 72. Color of Mohr's salt is
(d) Pale green color due to Fe2+ ions. 73. Mohr's salt is
- Acid salt
- Basic salt
- Mixed salt
- Double salt
(d) Double salt (FeSO4.(NH4)2SO4.6H2O). 74. FeSO4 forms brown ring with
(a) Brown ring test for nitrates: [Fe(H2O)5NO]2+. 75. Formula of Brown ring is
- Fe2SO4
- FeSO4
- Fe2SO2.2NO2
- FeSO4.NO
(d) [Fe(H2O)5NO]SO4 (simplified as FeSO4.NO). 76. Which among FeO and Fe2O3 is more basic?
- FeO
- Fe2O3
- Both have same basic strength
- None
(a) FeO (Fe2+) is more basic than Fe2O3 (Fe3+). 77. Oxidation state of Fe in haemoglobin is
(b) Haemoglobin contains Fe2+ in heme group. 78. Iron is obtained on a large scale from Fe2O3 by
- Reduction with Al
- Smelting with carbon
- Calcination
- Water gas
(b) Blast furnace uses coke (C) as reducing agent: Fe2O3 + 3CO → 2Fe + 3CO2. 