Jamb Chemistry 1994 Past Questions and Answers

Question 16:

• JAMB 1994

The solubility, in moles per dm³ of 20.2 g of potassium trioxonitrate (V) dissolve in 100 g of the resulting mixture is?
(K = 39, O = 16, N =14).

A. 0.10
B. 0.20
C. 1.00
D. 2.00

Question 17:

• JAMB 1994

Which of the following atoms represents deuterium?

A. No protons = 1, No of neutrons = 0, No of electrons = 0
B. No protons = 1, No of neutrons = 0, No of electrons = 1
C. No protons = 1, No of neutrons = 1, No of electrons = 1
D. No protons = 1, No of neutrons = 2, No of electrons = 1

Question 18:

• JAMB 1994

A few drops of concentrated PCI are added to about 10cm³ of a solution of pH 3.4. The pH of the resulting mixtures is?

A. Less than 3.4
B. Greater than 3.4
C. Unaltered
D. The same as that of pure water

Question 19:

• JAMB 1994

Which of the following compounds is a base?

A. CO₂
B. CaO
C. H₃PO₃
D. CH₃COOCH₃

Question 20:

• JAMB 1994

20 cm³ of a 2.0 M solution of ethanoic acid was added to excess of 0.05 M sodium hydroxide. The mass of the salt produced is?
(Na = 23, C = 12, O = 16, H = 1)

A. 2.50 g
B. 2.73 g
C. 3.28 g
D. 4.54 g