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

Question 16:

• JAMB 1980

If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litre of water,and resulting solution mixed thoroughly, the resulting sulpuric acid concentration will be?

A. 2.2 M
B. 1.1 M
C. O.22 M
D. 0. 11 M
E. 0.20 M

Question 17:

• JAMB 1980

Which of the following statement is false?

A. Acids react with some metals, liberating hydrogen
B. Acids react with carbonates, liberating carbondioxide
C. Acids conduct electricity and are decomposed by the current, liberating hydrogen at the anode
D. Acids have a sour taste
E. Acids change the colour of indicators

Question 18:

• JAMB 1981

The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?

A. Na₂SO₄ + SO₂ + O₂ + H₂O
B. Na₂SO₃ + SO₃ + O₂ + H₂O
C. Na₂SO₄ + SO₂ + S + H₂O
D. Na₂SO₄ + SO₃ + S + H₂O
E. Na₂SO₄ + SO₂ + H₂O only

Question 19:

• JAMB 1981

Pure sulphuric acid is a liquid of 1:84 density. What volume of it would be required to prepare 250 cm³ of 2.0 M solution?
(H = 1, S = 32, O = 16)

A. 2.00
B. 2.66
C. 3.00
D. 3.66
E. 4.00

Question 20:

• JAMB 1981

When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?

A. Both gases change the colour of the solution from yellow to colourless
B. Both gases causes sulphur to be deposited
C. Only hydrogen sulphide decolourizes the solution
D. Only sulphur dioxide deposits sulphur
E. Only hydrogen sulphide deposits sulphur