Chemistry Past Paper PDF

Emad Bakr Chemistry Rev. Chapter 1 1 G.S. Questions of previous exams 1) Write the scientific term: 1- The element that possesses an incompletely filled d or f sublevel in either the free state or in one of its compounds....

Emad Bakr Chemistry Rev. Chapter 1 1 G.S. Questions of previous exams 1) Write the scientific term: 1- The element that possesses an incompletely filled d or f sublevel in either the free state or in one of its compounds. ( Aug.96 –Az.16) 1| 2- An element resists the effect of atmosphere although it’s highly reactive. (Sud. 16 ). 3- The substance that's attracted to an external magnetic field due to the presence of unpaired electrons in its orbitals. ( May 2016) 4- The substance that repels to an external magnetic field due to the presence of paired electrons in its orbitals. ( 91 – May 15 – Trial 16) 5- Magnetic property for the ions , atoms or the molecules whose unpaired electrons in its orbitals. (Sud. 16 ). 6- The collection of the particles of fine iron ore to obtain large particles suitable for reduction. (11 –14 - 15 ). 7- Heating iron ore strongly in air for drying and getting rid of impurities. ( 92 –Trial 02- 12- 14 – Sud 16 ) 8- A compound decomposed thermally into iron II oxide and carbon dioxide. 9- Elements in which the sublevel 3d is filled successively. (Trial 16 ). 10- Elements in which the sublevel 4d is filled successively. (Trial 16 ). 11-An alloy in which the atoms forming it have the same diameter and chemical properties and crystal structure. (May 04 ). 12- The formation of the thin layer of oxide that protect the metal from further reaction. (May 15 – Aug 03, 11 ). 13- An alloy in which chemical combination between the elements of the alloy takes place. ( Sud.08 ) 14- the removing of the impurities from iron ore to increase the percentage of iron. (Trial 16 ). More 15- Elements in which the sublevel 5d is filled successively. 16- Elements in which the sublevel 6d is filled successively. 17- An alloy in which smaller atoms are introduced in the spaces of the crystal lattice of the pure metal atoms. 18-The elements whose general formula: (n-1)d1:10, ns1:2. 19- The no. of unpaired electrons in d sublevel in d block elements. 20-the element that possesses an incompletely filled d or f sublevel in either the free state or in one of its compounds.  Emad Bakr Chemistry Rev. Chapter 1 2 G.S. 21-An alloy consists of copper and tin. 22-An alloy consists of copper and zinc. 23- An iron ore which is red and easily to be reduced. 24-An iron ore which is black and has magnetic property. 2| 25-An iron ore which is hydrated iron III oxide. 26-An iron ore which is iron II carbonate. 27-The most active element in the first transition elements. ----------------------------------------------------------------------------------------------- 2-Choose: 1- [Ar],3d10, 4S2 is the electronic configuration of ……….metal. (a) iron (b) copper (c) scandium (d) zinc (Eg 92 ). 2- The electronic configuration of the ……………ion is *Ar+,3d5 while The electronic configuration of the …………ion is*Ar+, ↑ ↑ ↑ ↑ (a) Cr2+/Co3+ (b) Fe3+/ Cr2+ (c) Fe2+/ Fe3+ (d) Co3+/ Fe2+ (Trial 10 ). 3- The element that has the electronic configuration [Ar],3d10, 4S1 is ….. (a) scandium (b)vanedium (c)manganese (d) copper (Trial 16 ). 4- The compound(FeCl2) is…………… (93 - 11- Trial 16 ). (a)paramagnetic and coloured (b) diamagnetic and colourless (c) paramagnetic and colourless (b) diamagnetic and coloured 5- Stainless steel is an alloy formed from iron and ………… (a) cobalt (b) manganese (c) copper (d) chromium (95-10 ). 6- The electronic configuration of the elements of the group before the last group of (d) block is …….. (Trial 16 ). 1 1 1 1 ( a) (n-1)d , ns (b) (n-2)d , ns 2 1 (c) (n-1)d , ns (d) (n-1)d10, ns1 7- Limonite is one of the iron ores that occurs in oasis area, its chemical formula is ……. (a) 3Fe2O3.2H2O (b) 2Fe2O3.3H2O (09). (c) Fe2O3.2H2O (d) Fe2O3.H2O 8- Siderite is ……. (08). a- magnetic iron oxide b- hydrated iron III oxide c- an hydrous iron II oxide d-iron II carbonate 9- When iron is dissolved in dil Sulphuric acid, …… is formed. (05 - 07). (a)Fe2(SO4)3 +H2O (b)FeSO4 +H2O (c) FeSO4 +H2 (d) Fe2(SO4)3 +H2  Emad Bakr Chemistry Rev. Chapter 1 3 G.S. 10- Maximum oxidation state of any element cannot exceed its group number except group ……… (a) IB (b) IIB (c) IIIB (d) VB (Trial 16 ). 11- In the figure , the catalytic activation 110 3| energy equal....kJ/mole a) 50 210 b) 100 c) 80 180 d) 130 (Trial 16 ). 12- On adding conc. Nitric acid to iron ……………. are formed. a) Iron II nitrate and hydrogen. b) Iron III nitrate and water. c) Iron III nitrate and water and nitric oxide. d) Non porous layer of oxide. 13- The reduction process of iron ores is completed in Midrex furnace by using… a) CO gas only b) H2 gas only c) mixture of CO and H2 gases. d) mixture of N2 and CO gases 14- The right electronic configuration of copper (II) ion is ………. 0 9 1 10 a) [Ar], 4s , 3d b) [Ar], 4s , 3d C) [Ar], 4s , 3d d) [Ar], 4s1, 3d8 2 9 15- The element that its electronic configuration is 6s2, 5d3, 4f14 is from ……. Elements [2010- 2014] a) first transition series b) third transition series c) lanthanide series d) fourth transition series 16- On reacting iron with chlorine then adding sodium hydroxide to the product, the final product is: a- FeCl2 b- Fe(OH)3 c-FeCl3 d-Fe(OH)2 +3 17- (X ) is ion of transition element has electronic configuration [18Ar]4s0,3d5, so its atomic number is….. a) 24 b) 25 c)26 d)27 18- Magnetic moment depends on the number of unpaired electrons, which of the following elements has the greatest magnetic moment: a) 3d2 b) 3d5 c) 3d7 d) 3d8 19- Which of the following not used in the extraction of Iron from the Hematite ore: a) Coke coal b) Carbon monoxide gas c) Methane gas d) Carbon dioxide  Emad Bakr Chemistry Rev. Chapter 1 4 G.S. 20- When a solution of Iron II Sulphate exposed to atmospheric air for sufficient time then adding Sodium l Hydroxide solution a reddish brown ppt is formed due to the reactions of: a) reduction then precipitation b) precipitation then oxidation 4| c) Oxidation then precipitation d) precipitation the reduction 21- Iron exists in the free state in ………. a) haematite b) meteorites c)limonite d) siderite Choose with explaining the reasons: 21- Ion of Manganese II ………… oxidize to Manganese III Ion. a) easy to b) difficult to c) cannot d) no right answer 3) How to obtain: 1- Iron III oxide from magnetic iron oxide. 2 Fe3O4(s) + ½ O2(g)→ 3 Fe2O3(s) 2- Iron III oxide from siderite. Fe CO 3(s) → FeO (s) +CO 2 (g ) / 2FeO (s) + ½ O 2 (g) →Fe 2 O 3 (s ) 3- Iron III oxide from iron II oxalate. [95- 16] (CO O)2 Fe(s)→ FeO(s) + CO(g) + CO2(g) / 2FeO (s) + ½ O2 (g) →Fe2O3 (s) 4- Iron III sulphate crystals from iron. [ 89 – Az. 16] 3 Fe (s)+ 2 O2 (g) → Fe3 O4 (s) 2 Fe3O4(s) + ½ O2(g)→ 3 Fe2O3(s) Fe2O3(s) + 3 H2SO4(aq) → Fe2(SO4)3(aq)+ 3H2O(l) 5- Iron II hydroxide from iron filling. Fe(s) + HCl (aq) → Fe Cl2(aq) + H2(g) Fe Cl2(aq) + 2NaOH → Fe(OH)2 +2NaCl 6- Iron III sulphate from iron II oxalate. (CO O)2 Fe(s)→ FeO(s) + CO(g) + CO2(g) 2FeO (s) + ½ O2 (g) →Fe2O3 (s Fe2O3(s) + 3 H2SO4(aq) → Fe2(SO4)3(aq)+ 3H2O(l) 7- Iron III oxide from iron III chloride. Fe Cl3(aq) + 3NH4OH(aq) Fe(OH)3(s) +3 NH4Cl(aq) 2 Fe(OH)3(s) → Fe2O3(s)+ 3 H2O(v) 8- Iron III oxide from iron II sulphate. 2 FeSO4(s) → Fe2 O3(s) + SO2(g) + SO3(g) 9- Iron III oxide from iron fillings. 3 Fe (s)+ 2 O2 (g) → Fe3 O4 (s) 2 Fe3O4(s) + ½ O2(g)→ 3 Fe2O3(s) 10- Iron III hydroxide from iron III chloride. no. 7  Emad Bakr Chemistry Rev. Chapter 1 5 G.S. 11- Iron II oxide from iron II oxalate. no. 6 12- The three iron oxides from siderite. Fe CO3(s) → FeO(s) +CO2 (g ) / 2FeO (s) + ½ O2 (g) →Fe2O3 (s) 5| 3 Fe2O3(s) + CO(g) → 2Fe3O4(s) + CO2(g) 13- Iron (III) chloride from magnetic iron oxide. 2 Fe3O4(s) + ½ O2(g) → 3 Fe2O3(s) 3 CO (g) + Fe2 O3 (s) → 2 Fe (s) + 3 CO2 (g) 2 Fe(s) + 3 Cl2 (g) → 2 Fe Cl3(s) 14- Iron III oxide by two different methods. 2 Fe(OH)3(s) → Fe2O3(s)+ 3 H2O(v) 2 FeSO4(s) → Fe2 O3(s) + SO2(g) + SO3(g) Or 4 FeO(s) + O2(g) → 2 Fe2O3(s) 2 Fe3O4(s) + ½ O2(g) → 3 Fe2O3(s) 15- Two oxides of iron by heating one compound of iron II. [Exp.16] 2 FeSO4(s) → Fe2 O3(s) + SO2(g) + SO3(g) Fe2O3(s) + H2(g) → 2 FeO(s) + H2O(v) Or Fe CO3(s) → FeO(s) +CO2 (g ) / 2FeO (s) + ½ O2 (g) →Fe2O3 (s) 16- Iron from iron (II) sulphate. [Exp. 16] 2 FeSO4(s) → Fe2 O3(s) + SO2(g) + SO3(g) 3 CO (g) + Fe2 O3 (s) → 2 Fe (s) + 3 CO2 (g) 17- Iron II hydroxide from iron III hydroxide. [Exp. 16] 3 CO (g) + Fe2 O3 (s) → 2 Fe (s) + 3 CO2 (g) Fe(s) + HCl (aq) → Fe Cl2(aq) + H2(g) Fe Cl2(aq) + 2NH4OH(aq) Fe(OH)2(s) +2 NH4Cl(aq) 18- Iron (II) sulphide from magnetic iron oxide. [Exp.16] 2 Fe3O4(s) + ½ O2(g)→ 3 Fe2O3(s) 3 CO (g) + Fe2 O3 (s) → 2 Fe (s) + 3 CO2 (g) Fe(s) + S(s) → Fe S(s)  Emad Bakr Chemistry Rev. Chapter 1 6 G.S. 19- Iron (II) sulphide from iron III oxide. [ Sudan16] Mor 1. Iron from iron (II) oxalate. 2. Iron (II) sulphate from iron (III) oxide. 6| 3 CO (g) + Fe2 O3 (s) → 2 Fe (s) + 3 CO2 (g) Fe(s) + H2SO4(aq) → Fe SO4(aq) + H2(g) 3. Reducing gases from methane. 2 CH4(g) + CO2(g) + H2O (v) → 3 CO(g)+ 5 H2(g) 4. Iron (III) sulphate from iron (III) chloride. Fe Cl3(aq) + 3NH4OH(aq) Fe(OH)3(s) +3 NH4Cl(aq) 2 Fe(OH)3(s) → Fe2O3(s)+ 3 H2O(v) Fe2O3(s) + 3 H2SO4(aq) → Fe2(SO4)3(aq)+ 3H2O(l) 5. Iron (II) chloride from iron (III) oxide. 6.. Magnetic iron oxide from iron. 7. Iron from ferrous sulphate ( two methods ). 8.. Iron III chloride from iron II oxide. 9. Iron II chloride from iron II sulphate. 10. Iron III chloride from iron II sulphate. 11. Iron III chloride from iron III sulphate 12. iron III chloride and iron II chloride from iron fillings. 13. the three iron oxides starting by iron. 14. Iron from a mixture of it and copper. By a magnet 15. Iron from an alloy of it and copper. By dil. HCl. 16. Magnetic iron oxide from a mixture of it and iron II oxide. By dil HCl 4) 1. 1-Titanium is preferred than aluminium in the manufacture of rockets. 2. 2-Vanadium is used in making car springs. 3. 3-Although chromium is an active metal, it resists atmospheric factors. 4. Ferro-manganese alloy is used in manufacture of railway lines. 5. Titanium used in cultivating artificial teeth and joints 6. Copper is used in the manufacture electric wires. 7. Chromium is anomalous from the expected electronic configuration of the first transition elements. 8. Iron (II) is easily oxidized to iron(III)while Mn(II) is not readily oxidized to Mn (III). 9. Elements of the first transition series have variable oxidation states. 10. Scandium has only one oxidation state (3+).  Emad Bakr Chemistry Rev. Chapter 1 7 G.S. 4+ 11. Sc ion is unlikely to occur can not be obtained easily. 12. Coinage metals can be considered as transition elements. 13. Zn can not be considered as a transition element. 14. Manganese and aluminium alloy used in manufacture of drink’s cans. 7| 15. The high melting and boiling points of transition series. 16. The magnetic moment increases till we reach manganese (d5) then decreases. 17. Zn atom is diamagnetic while Fe(II) ion is paramagnetic. 18. The elements of transition series are used as ideal catalyst. 19. TiO2 ( Titanium dioxide) is used for making cosmetics that protect the body from sun rays. 20. Manganese is not used in pure state 21. When iron reacts with dil hydrochloric acid, iron(II) chloride is formed but iron (III) chloride does not. 22. Conc. Nitric acid is kept in iron pots. 23. Hydrofluoric acid is kept in nickel. 24. The colour of iron II sulphate is changed to brick red colour when heated strongly. 25. The solution of iron III chloride has an acidic effect on litmus solution. 26. Cobalt is similar to iron.. 27. Chromium resists the effect of atmosphere although it’s active. 28. Gold and copper form a substetutional alloy. 29. the collection of the particles of fine ore to obtain large particles. 30. Magnetite is a mixture oxide. 31. The role of water gas differs in Midrix furnace than in Fischer – Tropsch method process. 32. The radius of transition elements is nearly constant. Or the decrease from left toright is very small. 5) *Arrange the following ions in descending order of their magnetic force attraction and give reasons for this arrangement 1- Ni2+, Fe3+, Co2+ (The atomic no,. of Fe =26, Co = 27 , Ni = 28 ). 2- FeCl3 , Cr2O3 , TiO2 The atomic no,. of Fe =26, Cr = 24 , Ti = 22 ). 6) What's meant by : transition element - paramagnetic elements - Sintering processes – Roasting- substitutional alloys- The Passivity - Iron Production  Emad Bakr Chemistry Rev. Chapter 1 8 G.S. 7) *If you are provided with the following substances (with Bunsen flame): Iron fillings – chlorine gas – carbon monoxide gas – diluted hydrochloric acid – ammonium hydroxide solution – distilled water. 8| by balanced equation how can you obtain each of the following compounds: 1- Iron III oxide. 2- Iron II hydroxide. 8) What's the effect of heat on: 1- Iron II oxalate in absence of air ( and in presence of air) 2- Iron II sulphate FeSO4. 3- Iron III hydroxide Fe(OH)3. 4- Siderite. in absence of air ( and in presence of air) 9) How to differentiate between: 1- Dil. And conc. H2SO4 By iron. 2- Fe3O4 and Fe by conc. H2SO4. Answers of scientific termn 1- Transition element. 2-Chromium. 3- Paramagnetic substance. 4- Diamagnetic substance. 5- Para magnetism. Paramagnetic property. 6- Sintering. 7- Roasting. 8- Iron II carbonate. 9- First transition series. 10- Second transition series. 11- Substitutional alloy. 12- Passivity. 13- Intermetallic alloy. 14- Concentrating the ore. 15- The fourth transition series. 16- The third transition series. 17- Interstitial alloy. 18- d block elements. 19- Magnetic momentum. 20-Transition element. 21- Bronze. 22- Brass. 23-Haematite. 24- Magnetite. 25-Limonite. 26- Siderite. 27-Scandium.