Jamb Chemistry 1995 Past Questions and Answers

Question 16:

• JAMB 1995

The difference between colloides and and suspensions is brought out clearly by the fact that while colloids?

A. Do not scatter light, suspensions do
B. Can be separated by filtration, suspension cannot be so separated
C. Can be separated by a membrane, suspensions cannot
D. Do not settle out on standing, suspensions do

Question 17:

• JAMB 1995

In general, an increase in temperature increases the solubility of a solute in water because?

A. More solute molecules collide with each other
B. Most solutes dissolve with the evoltion of heat
C. More solute molecules dissociate at hihger temperatures
D. Most solutes dissolve with absorption of heat

Question 18:

• JAMB 1995

Neutralization involves a reaction between H₃O⁺ and?

A. CI^-
B. OH^-
C. NO₃^-
D. CO₃^2-

Question 19:

• JAMB 1995

In the process of silver-plating a metal M, the metal M is the?

A. Anode and a direct current is used
B. Cathode and an alternating current is used
C. Anode and an alternating current is used
D. Cathode and a direct current is used

Question 20:

• JAMB 1995

How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?
(F = 96 500 C mol^-)

A. 0.5
B. 1.0
C. 1.5
D. 3.0