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.

11. Which of the following gases may not be dried with concentrated sulphuric acid?

  • A. HCl(g)
  • B. NH3
  • C. Cl2
  • D. SO2

12.  A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging

  • A. Al and Mg
  • B. Zn and Fe
  • C. Zn and Pb
  • D. Pb and H

13.  A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that

  • A. Collisions are perfectly elastic
  • B. Forces of repulsion exit
  • C. Forces of repulsion and attraction are in equilibrium
  • D. Collisions are inelastic

14.  On which of the following is the solubility of a gaseous substance dependent? 

I. Nature of solvent 

II. Nature of solute 

III. Temperature 

IV. Pressure

  • A. I, II, III and IV
  • B. I and II
  • C. II only
  • D. I, III and IV

15. Which of the following statements is correct about the periodic table?

  • A. Elements in the same period have the same number of valence electrons
  • B. The valence electrons of the elements in the same period increase progressively across the period
  • C.

     Elements in the same group have the same number of electron shells

  • D. The non-metallic Properties of the elements tend to decrease across each period

16.  The periodic classification is an arrangement of the elements

  • A. Atomic weights
  • B. Isotopic weights
  • C. Molecular weights
  • D. Atomic weights

17.  If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litres of water and the resulting solution mixed thoroughly, the resulting sulphuric acid concentration will be

  • A.  2.2M
  • B. 1.1M
  • C. 0.22M
  • D. 0.11M

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In the shown experiment (Fig. 1) the litmus paper will initially

  • A. Be bleached
  • B. Turn green
  • C. Turn red
  • D. Turn blue

19.The boiling of fat and aqueous caustic soda is referred to as

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

20. Which of the following pairs of substances will react further with oxygen to form a higher oxide?

  • A. CO2 and H2O
  • B. N0 and H20
  • C. C0 and Co2
  • D. SO2 and NO

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