Jamb Chemistry Past Questions and Answers

Question 401:

• 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 402:

• 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 403:

• 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 404:

• 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

Question 405:

• JAMB 1985

A certain industrial process is represented by the chemical equation 2A_(g) + B_(g) \(\to\) C_(g) + 3D_(g) \(\Delta\)H = X kJmol^-1. Which of the following conditions will favour the yield of the products?

A. Increase in temperature, decrease in pressure
B. Increase in temperature, increase in pressure
C. Decrease in temperature,increase in pressure
D. Decrease in temperature, decrease in pressure
E. Constant in temperature, increase in pressure