Jamb Chemistry 1985 Past Questions and Answers

Question 1:

• JAMB 1985

X + Y = Z is an equilibrium reaction. The addition of a catalyst?

A. Increase the amount of Z produced in a given time
B. Increases the rate of change in concentrations of X, Y and Z
C. Increases the rate of disapearance of X and Y
D. Increases the rate of the forward reaction
E. Decreases the amounts of X and Y left after the attainment of equilibrium

Question 2:

• JAMB 1985

X + Y = Z is an equilibrium reaction. The addition of a catalyst?

A. Increase the amount of Z produced in a given time
B. Increases the rate of change in concentrations of X, Y and Z
C. Increases the rate of disapearance of X and Y
D. Increases the rate of the forward reaction
E. Decreases the amounts of X and Y left after the attainment of equilibrium

Question 3:

• JAMB 1985

What is the formula of sodium gallate if gallium (Ga)shows an oxidation number of + 3?

A. NaGaO₃
B. Na₂Ga(OH)₃
C. NaGa(OH)₃
D. NaGa(OH)₄
E. NaGaO

Question 4:

• JAMB 1985

If the ONLY pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds. carbon monoxide and high levels of methane, the probable source(s) of the pollution must be?

A. Automobile exhaust and biological decomposition
B. Combustion of coal and automobile exhaust
C. Biological decomposition only
D. Combustion of coal, automobile exhaust and biological decomposition
E. Combustion of coal and biological decomposition

Question 5:

• JAMB 1985

A correct electrochemical series can be obtained from K, 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
E. Au and Hg