Acids, bases and salts - Jamb Chemistry Past Questions and Answers

Question 76:

• JAMB 1993

Al₂O_3(s) + 3H₂SO_4(aq) → Al₂(SO_4(aq)) + 3H_2(I)O
Al₂O_3(s) + 2NaOH_(aq)) + 3H_2(I)O → 2NaAl(OH)_4(aq)).
We can conclude from the equations above that Al₂O_3(s) is?

A. An acidic oxide
B. An amphoteric oxide
C. A basic oxide
D. A neutral oxide

Question 77:

• 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 78:

• 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 79:

• JAMB 1994

Which of the following compounds is a base?

A. CO₂
B. CaO
C. H₃PO₃
D. CH₃COOCH₃

Question 80:

• JAMB 1994

Which of these metals CANNOT replace hydrogen from alkaline solutions?

A. Alulinium
B. Zinc
C. Tin
D. Iron