CHM 101
7
1. Which of the following alcohols is popularly known as “fuel alcohol”? (a) Propanol (b) Butanol (c) Pentanol (d) Cyclohexanol
2. C(CH3)2 (OH) – C(CH3)2 – C(OH)2 – CH3, the name of the above compound is (a) 2,3,3-trimethylpentan-2,4,4-triol (b) 1,1,2,2-tetramethylbutan-1,3,3-triol (c) 3,3,4-trimethylpetan-2,2,4-triol (d) 2,3,4-trimethylpentan-1,2,2-triol
3. An element X has 54 protons, the group which X belong is (a) Transition (b) Lanthanide (c) Noble gas (d) chalcogen
4. The triad concept of grouping three elements of similar properties was done by (a) Dmitri Mendeleef (b) John Newland (c) Henry Moseley (d) Wolfgang Doberenier
5. A gas absorbs 2000J of heat and expands by 1.5dm3 against a constant pressure of 3atm the change in internal energy is approximately (a) +1545.5J (b) +2454.5J (c) -1545.5J (d) -2454.5J
6. Which of the following is not a state function? (a) Entropy (b) Work (c) Free energy (d) Internal energy
7. Which of the following alcohols has the least melting point? (a) 2,2 – dimethylproan – 1 – ol (b) 2 – methylpentan – 2 - 0l (c) 2,3 – dimethylbutan – 1 – 0l (d) 4 – methylbutan – 2 – 0l
8. What class of alcohol is 2-methylcyclohexan – 1 – 0l? (a) Dihydric alkanol (b) Primary alkanol (c) Secondary alkanol (d) Tertiary alkanol
9. F- → F + -e ΔH = -xkJmol-1 from the above, the reversed enthalpy change is (a) Ionization energy (b) Affinity energy (c) Electronegitivity energy (d) Electron Affinity
10. Which of the following equations justify the general name given to the Group 1 metals of the periodic table? (a) 2X + 2H2O → 2XoH + H2 (b) 2XNO3 → 2XNO2 + O2 (c) 2X + H2 → 2XH (d) X → X+ + -e
11. The polyhydric alcohol which is usually used in the production of cream, ointment and cosmetics is (a) Ethan-1,2-diol (b) Propan-1,2,3-triol (c) Butan-1,2,3,4-tetrol (d) Pentan-1,2,3,4,5 – Pentol
12. Which of the following is not correct about the solubility trend of alcohols? (a) As the number of OH increases, the alcohol becomes more soluble. (b) As the number of carbon atom increases, the solubility in benzene reduces (c) As more electronegative elements are substituted for hydrogen, solubility increases (d) As the number of carbon atoms increases, the solubility in water decreases.
13. Arrange the following atoms in order of increasing atomic radius 9F, 4Be, 13Al, 16S and 10Ne. (a) 4Be < 9F < 10Ne < 13Al < 16S (b) 10Ne < 13Al < 16S < 9F < 4Be (c) 4Be < 13Al < 16S < 9F < 10Ne (d) 10Ne < 9F < 4Be < 16S < 13Al
14. I Noble gases
II Halogens
III Chalcogens
IV Alkaline earth metals
Which of the above elements have ionization energy of approximately zero? (a) I, II, III and IV (b) I only (c) I, II and III only (d) I and IV only
15. An alkanol has a molar mass of 158g/mol, the name of its proceeding homologue is (a) Decanol (b) Nonanol (c) Octanol (d) Undecanol
16. H – C – C – C – H
The nomeri clature of the above compound is (a) 1,1 – diphenylpropan-1,2-diol (b) 1,1-diphenylpropan-2,3-diol (c) 3,3-diphenylpropan-1,2-dio; (d) 3,3-diphenylpropan-2,3-diol
17. Which of the following statements is not correct? (a) when work is done on a system, wis +ve (b) When there is increase in internal energy of a system, Δu is +ve (c) When heat is absorbed from the surrounding into a system, q is +ve (d) When a given volume of a gas expands, PΔv is –ve.
18. OH The name of the above alcohol is (a) 2 –methyl-3-ethylbenzano (b) 5-ethyl-2-methylbenzanol (c) 3 – ethyl-2-methylbenzanol (d) 4-ethyl-1-methylbenzano
19. The electronic configuration of an element D is given as: 152 252 2p6 352 3p6 452 3d10 4p6 552 4d10 5p6 6s1 which of the following is not true about D? (a) It is an alkalimetal (b) It is a period 6 element (c) It is the most electropositive element (d) It forms a stable oxide
20. If 1.0kcal of heat is added to 1.2dm3 of oxygen in a cylinder at constant pressure of 1.0-atm, the volume increases to 1.5dm3. Calculate the change in internal energy for then process. (1atm = 1.01 x 105Nm-2, 1cal = 4.184J) (a) -4154J (b) +4154J (c) +4214J (d) – 4214J
21. Who among the following chemists is reffered to as “the father of thermodynamics”? (a) Sadi Carnot (b) Willard Gibbs (c) Rudolf clausius (d) Micheal Firaday
22. What is the name of the above alkano? (a) Heptan-2,5-diol (b) Heptan – 3,5 – diol (c) 2 – methylhetan – 2 5 – diol (d) 2 – methylheptan – 3, 6 – diol
23. Its nomenclature is (a) Butan – 2 – ol – 1 – ene – 3 – yne (b) Butan – 1 – ene – 2 – ol – 3 – yne (c) Butan-1-yne – 3 – ene – 3 – ol (d) Butan – 3 – yne – 1 – ene – 2 – ol
24. The elements on the periodic table with symbols Sb and W are respectively (a) Seaborgium and Tungsten (b) Seabogium and Wolfmium (c) Antimony and Tungsten (d) Antimony and Wolfmium
25. Arrange the above alcohols in order of increasing boiling point (a) I > II > III > IV (b) II > III > I > IV (c) III > IV > II > I (d) III > IV > II > I
26. Which of then following is constantly exothermic? (a) Enthalpy of formation (b) Enthalpy of Solution (c) Enthalpy of neutralization (d) Enthalpy of reaction
27. Which of the following alkalimetals has its trioxocarbonate IV salt to be a thermolabile salt? (a) Lithium (b) Pottasium (c) Caesium (d) Rubidium
28. Which of the following elements are mostly radioactive on the periodic table? (a) Transition elements (b) Actinide elements (c) Lanthanide elements (d) Noble gases
29. Determine the enthalpy change for the reaction: N2 + H2 → NH3, given bond dissociation energies N – N = 163kJmol-1 and N – H = 391 KJmol-1 (a) – 875KJ (b) + 875KJ (c) – 474KJ (d) + 474KJ
30. Which of the following hydroxides is the most soluble? (a) Be(OH)2 (b) Ca(OH)2 (c) Sr(OH)2 (d) Ba (OH)2
31. How many resonance structures has SO42-? (a) four (b) five (c) six (d) eight
32. The correct bond angles for H2), NH3, Co2 and BF3 (a) 104.50, 1070, 1800, 1200 (b) 1200 1070, 1800, 1050, (c) 1070, 1200, 1800, 109.50 (d) 1070, 109.50, 1800, 1200
33. :N N –
From the above Lewis structure, the formal charge of Oxygen is (a) 0 (b) +1 (c) _1 (d) –2
34. The geometry of Sf4 is (a) Trigonal planar (b) see-saw (c) square pyramidal (d) Tetrahedra
35. Which of the following statements is incorrect about hydrogen bonding? (a) It exists in all hydrogen containing compounds (b) It occurs when hydrogen is bonded to a highly electronegative element (c) It is responsible for the high boiling point of water (d) It exist where we have O-H, N-H, and F-H bonds
36. Which of the following do you expect to be non-polar (a) H2O (b) NH3 (c) HF (d) CH4
37. which of the following structure show exception to the OCTET RULE? (a) H2O (b) PCl3 (c) Sf6 (d) CH4
38. An ionic compound is not likely to have one of this property (a) Higher melting point (b) solubility in water (c) Good electrolyte when dissolved (d) electrical conductor in solid state
39. The molecular shape of PF5 is (a) octahedral (b) Trigonal bipyramidal (c) Irregular tetrahedron (d) Square pyramid.
40. Which of the following species is expected to have tetrahedral electron pair geometry? (a) AsF4 (b) SF4 (c) SiCl4 (d) XeF4.
41. In accordance with VSEPR theory the correct shape of O3 is
42. VSEPR basically states that (a) The repulsion of atomic nuclei helps determine the shapes of covalent molecules. (b) The repulsion between electrons helps determine the shapes of covalent molecules. (c) The repulsion between bonds helps determine the shapes of covalent molecules. (d) The attraction between electron pairs around an atom helps determine the shapes of covalent molecules.
43. One of these statement is not true of aluminium: (a) (a) its oxide is amphoteric (b) It is the least abundant metallic element in the earth crust. (c) It is easily passivated with a layer of oxide film. (d) It can be obtained by the hall process.
44. The most important compound of aluminum and hydrogen used as reducing agent in many organic reactions is (a) LiALH (b) LiALH2 (c) LiALH3 (d) LiALH4.
45. Which of the following statements is not true of the group III elements? (a) The valence configuration is ns2np. (b) Principal oxidation state is +3 (c) Metallic character decreases down the group. (d) The +1 oxidation number is only important down the group.
46. Which of the following is not true of halogen? (a) They rarely form itnerhalogen compounds (b) They form halides with non-metals (c) Electronegativity increases down the group. (d) Each halogen displaces the halogens below it form solution.
47. The order of water solubility of the carbonates of the element is (a) BaCO3 < CaCO3 < MgCO3 <BeCO3 (b) BeCO3 < MgCO3 < CaCO3 < BaCO3 (c) CaCO3 < BaCO3 < BeCO3 < MgCO3 (d) MgCO3 < BeCO3 < BaCO3 < CaCO3.
48. Which of the following statements describe(s) the features of the periodic table?
I. Metallic character increases down the group.
II. Conductivity of metalloids increase with temperature.
(a) I only (b) I and II only (c) I and III only (d) I, II and III
49. Which of these elements will not give an M2O3 on reaction with oxygen? (a) Al (b) Tl (c) B (d) Ga E. None.
50. The main factors that affect ionization energy are:
I. The effective nuclear charge
II. The number of energy levels
III. Shielding of electrons
(a) I and II only (b) II and III only (c) I and III only (d) I, II and III
51. In spite of being chemically inert, which one of these noble gases forms an appreciable number of compounds? (a) Helium (b) Argon (c) Neon (d) Xenon.
52. What is the order of stability of these MH3 types of hydrides? (a) NH3 > PH3 > BiH3 (b) NH3 > BiH3 > PH3 (c) PH3 > NH3 > BiH3 (d) BiH3 > PH3 > NNH3.
53. One of these hydroxides is readily converted to oxide on heating. (a) NaOH (b) Al(OH)3 (C) LiOH (d) KOH.
54. The paramagnetism of transition element compounds is due to (a) Paired electrons in the d-orbitatls (c) Shared valence electrons (d) Unshared valence electrons.
55. The least reactive of all the noble gases is (a) Helium (b) Neon (c) Argon (d) Xenon.
56. Which of these have the oxidation state of +3 only? (a) Vanadium (b) Titanium (c) Chromium (d) Scandium.
57. Cobalt is the transition metal of vitamin ______(a) A (b) B12 (c) D12 (d) C.
58. The metal with the largest atomic radius is (a) Chromium (b) Vanadium (c) Copper (d) Cobalt.
59. The noble gas element which is used to full filaments of lamps is (a) He (b) Ar (c) Ne (d) Kr.
60. Major use of sulphur will include (a) Manufacture of petroleum refining (b) Rubber hardening (c) Making explosives (d) All of the above.
61. If an exothermic reaction result in great disorder, the combined changes in the enthalpy and entropy will lead to (a) Large decrease in free energy (b) Spontaneous reaction (c) Negative ΔH (d) All of the above.
62. In the exothermic reaction,
N2(g) + 3H2(g) 2NH3(g)
(a) Energy of the reactant is less than the energy of the products. (b) Energy is the reactant of the reaction (c) Reaction vessel becomes cooler (d) None of the above.
63. The heat of combustion of 1g of ethanol used in heating 100g of water at temperature between 70oC and 80oC is (a) -193KJmol-1 (b) +193KJmol-1 (c) +91.14KJmol-1 (d) +93548KJmol-1.
(relative molecular mass of ethanol = 46, heat capacity of water = 4.2Jg-1K-1).
64. When a system dies 56J of work and its internal energy decreases by 84J, the heat absorbed o released is (a) 28J (b) -28J (c) 140J (d) -140J.
65. Which of the following is or are exothermic? I Heat of solution II Heat of combustion III Heat of formation IV Heat of neutralization
(a) I (b) II (c) I and II (d) I and IV
66. The energy changes that accompany the ignition of a mixture of hydrogen and oxygen are: (a) Heat and sound (b) Light and heat (c) Sound and light (d) Chemical and kinetic.
67. C (graphite) + O2(g) CO2(g) = 393.5KJmol-1
2H2(g) + O2(g) 2H2O(1) = -571.6KJmol-1
CH4(g) + 2O2(g) CO2(g) + 2H2O(1) = +890.4KJmol-1
Determine the enthalpy of formation of methane
C(graphite) + 2H2(g) CH4(g)
(a) -74.7KJmol-1 (b) +74.7KJmol-1 (c) -149.4KJmol-1 (d) +149.4KJmol-1
68. 10g of CaC2 are reacted with an excess of water at 20oC and atmospheric pressure. Calculate the work done in expansion against the atmosphere by the ethylene evolved during the reaction.
CaC2(s) + 2H2O(1) Ca(OH)2(s) + C2H2(s)
(a) -381J (b) +381J (c) -762J (d) +762J
69. If a gas absorbs 1000J of heat and expands by 0.5dm3 against a constant pressure of 2atm, the change in internal energy is approximately
(a) -1.101KJ (b) +1.101KJ (c) -0.899KJ (d) -0.899KJ
70. The influence of entropy on a process is given by (a) The first law of thermodynamics (b) The second law of thermodynamics (c) Law of constant heat summation (d) Born-Haber cycle.