Chemistry 2018 Past Questions | JAMB

Study the following Chemistry past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

41. In the laboratory preparation of oxygen, the gas cannot be collected by displacement of air because

  • A. The density of oxygen is greater than that of air
  • B. The density of air is nearly the same as that of oxygen
  • C. Oxygen is a component of air
  • D. Air is an impure substance

42.

2KClO3(g) MNO3→ 2KCl(s) + 3O2(g)

The importance of the catalyst in the reaction above is that

  • A. Heating may not be required before the reaction takes place
  • B. The reaction is controllable even at a high temperature
  • C. The reaction produces large quantity of oxygen
  • D. The reaction takes place more rapidly at a lower temperature

43. Which of the following is used to power steam engines?

  • A. Lubricating oil
  • B. Coal
  • C. Bitumen
  • D. Diesel oil

44. In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?

  • A.  5 cm3
  • B. 10 cm3
  • C. 20 cm3
  • D. 50 cm3

45. To what volume must 300cm3  of 0.60M sodium hydroxide solution be diluted to give a 0.40M solution?

  • A.  450 cm3
  • B.  300 cm3
  • C.  200cm3
  • D. 150 cm3

46.  Diamond is a bad conductor of electricity because its bonding electrons are used in

  • A. Crystal lattice formation
  • B. Covalent bond formation
  • C. Metallic bond formation
  •  D.Coordinate bond formation

47. The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;

  • A. Saponification
  • B. Dehydration
  • C. Esterification
  • D. Hydrolysis

48.  The constituent common to duralumin and alnico is

  • A.  Co
  • B. Mn
  • C.  AI
  • D. Mg

49. The solubility of the solids that dissolves in a given solvent with the liberation of heat will

  • A. Increase with an increase in temperature
  • B. Decrease with an increase in temperature
  • C. Decrease with an decrease in temperature
  • D. Not be affected by changes in temperature

50.  What mass of Cu would be produced by the cathodic reduction of Cu^2+  when 1.60A of current passes through a solution of CuSO4  for 1 hour. (F=96500Cmol−1 , Cu=64)

  • A. 7.64g
  • B. 3.82g
  • C. 1.91g
  • D. 0.96g

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