Jamb Chemistry 2013 Past Questions and Answers

Question 16:

• JAMB 2013

Three drops of a 1.0 mol dm^-3 solution of HCl was added to 20 cm³ of a solution of pH6.4. The pH of the resulting solution will be

A. Close to that of pure water
B. Less than 6.4
C. Greater than 6.4
D. Unaltered

Question 17:

• JAMB 2013

Which of the following substances is not a salt?

A. Aluminium oxide
B. Sodium hydrogentrioxosulphate (V)
C. Sodium trioxocarbonate (V)
D. Zinc chloride

Question 18:

• JAMB 2013

An insoluble salt can be prepared by

A. The reaction of trioxocarbonate (V) with an acid
B. Double decomposition
C. The action of dilute acid on an insoluble base
D. The reaction of metals with an acid

Question 19:

• JAMB 2013

2H₂O _(l) + 2F_2(g) → 4HF_(aq) + O_2(g).
In the reaction above, the substance that is being reduced is

A. O_2(g)
B. H₂O_(l)
C. F_2(g)
D. HF_(aq)

Question 20:

• JAMB 2013

In an electrochemical cell, polarization is caused by

A. Chlorine
B. Oxygen
C. Tetaoxsulphate (Vl) acid
D. Hydrogen