Chemistry 2013 Jamb Past Questions and Answers

Question 11 :

• JAMB 2013

An example of a hygroscopic substance is

A. CuO _(S).
B. MgCL_2(S).
C. CaCL_2(S).
D. NaOH_(S).

Question 12 :

• JAMB 2013

If 24.4 g of lead (ll) trioxonitrate (V) were dissolved in 42 g of distilled water at 20^oC; calculate the solubility of the solute in gdm^-3.

A. 581.000.
B. 0.581
C. 5.810
D. 58.100

Question 13 :

• JAMB 2013

The solvent used for removing grease stain is

A. Turpentine
B. Ammonia solution
C. Ethanol
D. Solution of borax in water

Question 14 :

• JAMB 2013

In a water body, too much sewage leads to

A. A decrease in the temperature of the water which cause in death of aquatic animals
B. An increase in the number of aquatic animals in the water
C. An increase in the bacterial population which reduces the level of oxygen in the water
D. A decrease in the bacterial population which increases the level of oxygen in the water

Question 15 :

• JAMB 2013

10.0 dm³ of water was added to 2.0 mol dm^-3 of 2.5dm³ solution of HCl. What is the concentration of the final solution in mol dm^-3?

A. 0.4
B. 8.0
C. 2.0
D. 0.5