Chemistry Exam

41. Which statement distinguishes equivalence point from end point in acid base titration?

A. Equivalence point is a point at which the indicator changes color whereas end point is the point where an acid has completely reacted with a base.
B. End point is a point at which the indicator changes color whereas equivalence point is the point where an acid has completely reacted with a base.
C. Equivalence point is a point at which reactants start to evaporate whereas end point is the point where a product starts to condense.
D. Equivalence point is a point at which reactants start to melt whereas end point is the point where products star to freeze.

42. Which one is the mathematical expression for Faraday's first law of electrolysis?

A. m = MPV / RT
B. m = MIt / nF
C. m₁ / E₁ = m₂ / E₂
D. M = n / V(liter)

43. Which of the following describes the process of manufacturing valuable products in industries?

A. Carry out unwanted reaction of a material that result in the dissolution or consumption of the material.
B. Manufacturing industry uses only in organic chemicals in the production of valuable products.
C. Designing to produce a desired output from raw materials using energy through different steps.
D. Discharging of a solid, liquid or gaseous substance into an environment that causes unwanted changes.

44. Which of the following reaction shows the action of H2SO4 as oxidizing agent?

A. Cu(s) + 2H₂SO₄(aq) → CuSO₄(aq) + SO₂(g) + H₂O(l)
B. Mg₃N₂(s) + 4H₂SO₄(aq) → 3 MgSO₄(aq) + (NH₄)₂SO₄(aq)
C. SO₃(g) + H₂O(l) → H₂SO₄(aq)
D. 2KOH(aq) + H₂SO₄(aq) → K₂SO₄(aq) + 2H₂O(l)

45. Which law governs the fact that the ratio of the amount of hydrogen to oxygen by weight will be the same in a drop of water and a lake of water?

A. Law of multiple proportions
B. Law of definite composition
C. Law of relative composition
D. Law of conservation of mass

46. Which statement below CORRECTLY describes the characteristics of chemical equilibrium?

A. The rates of the forward and reverse reactions are equal.
B. A new substance or substances are formed when equilibrium is attained.
C. A reaction stops when it reaches equilibrium.
D. A reaction stops if sufficient amount of time is given.

47. What is the correct IUPAC nomenclature of the following alkane?

        CH₃        Cl
        |          |
  CH₃ - CH - CH₂ - CH - CH₂ - CH - CH₂ - CH - CH₃
                              |          |
                              Cl         CH₂CH₃

A. 4, 6-dichloro-2 ethyl -8 - methylnonane
B. 4, 6 -dichloro- 8-ethyl-2- methylnonane
C. 5, 7 - dichloro - 3, 9 - dimethyldecane
D. 4, 6 - dichloro - 2, 8 - dimethyldecane

48. What is the name given to compounds of carbon and hydrogen containing multiple bonds?

A. Saturated hydrocarbons
B. Unsaturated hydrocarbons
C. Aliphatic hydrocarbons
D. Aromatic hydrocarbons

49. 2-methyl-1-butene is one of the isomers of C₅H₁₀. Which of the following is the CORRECT structural formula of this isomer?

A.      CH₃                         C.       CH₃
        |                                    |
  CH₃ - C = CH - CH₃                   CH₃ - C = CH - CH₂

                                    D.          CH₃
B. CH₃ - CH=CH - CH₂ - CH₃                      |   
                                    CH₃ - CH₂ - C = CH₂

A
B
C
D

50. Which of the following organic compounds is used for the production of 1, 2-ethanediol?

A. Ethyne
B. Ethanol
C. Ethene
D. Ethane

51. Which of the following is the main constituent of natural gas?

A. Propane
B. Methane
C. Ethane
D. Butane

52. In order to avoid the decrease in quality of some clothes after washing with water, which of the following chemicals is used for dry cleaning?

A. C₂H₄
B. C₂Cl₄
C. CH₄
D. CH₂Cl₂

53. Which type of glass is made by heating a mixture of silica, sodium carbonate and limestone?

A. Pyrex
B. Soda-lime
C. Quartz
D. Borosilicate

54. Consider the following galvanic cell:

When the Zn strip was connected to metal "B" at 25°C, the cell potential reading on the voltmeter shows 0.51 V. Which of the following is the standard reduction potential of metal "B"?
(E°_{Zn²⁺ /Zn} = -0.79 V)

A. (E°_B²⁺/B = 0.25 V)
B. (E°_B²⁺/B = 1.27 V)
C. (E°_B²⁺/B = -0.25 V)
D. (E°_B²⁺/B = -1.27 V)

55. Which of the following polymer is used to make ropes, clothes, hair combs and stockings?

A. Teflon
B. Bakelite
C. Perspex
D. Nylon

56. Which of the following catalyst is used in the Ostwald process for the production of HNO₃?

A. Fe
B. CuO
C. V₂O₅
D. Pt

57. Scandium (Sc) has the electron configuration [Ar] 4s²3d¹. To which group of elements does it belong to?

A. Inner transition elements
B. Nonmetals
C. Representative elements
D. Transition elements

58. A student carried out an experiment to determine the melting points of NaCl and CuCl₂. He/she added 0.2 g of NaCl and CuCl₂ into two different test tubes and heated both tubes simultaneously using a Bunsen burner. Which of the following statements is CORRECT regarding the melting point of NaCl and CuCl₂?

A. Both NaCl and CuCl₂ will start to melt at the same time.
B. Both NaCl and CuCl₂ will not melt.
C. The melting points of NaCl are lower than that of CuCl₂.
D. The melting point of NaCl is higher than that of CuCl₂.

59. Consider the molecular structure of COCl₂ shown below:

What are the predicted bond angles Cl-C-O and Cl-C-Cl?

A. Cl-C-O > 120° and Cl-C-Cl < 120°
B. Cl-C-O < 120° and Cl-C-Cl > 120°
C. Cl-C-O and Cl-C-Cl = 120°
D. Cl-C-O < 120° and Cl-C-Cl = 120°

60. What is the cause of unusual high boiling points of HF, H₂O and NH₃?

A. Hydrogen bonding
B. Ion-dipole forces
C. Dipole-Dipole forces
D. Induced dipole forces

Chemistry Exam: Part 3

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