Jamb Chemistry Past Questions For Year 2018
Question 11
Which of the following is an example of a chemical change?
- A. dissolution of salt in water
- B. rusting of iron
- C. melting of ice
- D. separating a mixture by distillation
Question 12
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
Question 13
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. Nature of solvent
- B. I, II, III and IV
- C. I and II only
- D. II only
- E. III and IV only
Question 14
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 exist
- C. forces of repulsion and attraction are in equilibrium
- D. collisions are inelastic
Question 15
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
