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

Question 26:

• JAMB 1983

Which volume of 0.5 M H ₂SO₄ will exactly neutralize 20 cm ³ of 0.1 M NaOH solution?

A. 2.0 cm ³
B. 5.0 cm ³
C. 6.8 cm ³
D. 8.3 cm ³
E. 10.4 cm ³

Question 27:

• JAMB 1983

In the preparation of some pure crystals of Cu (NO₃)₂ starting with CuO, a student gave the following statements as steps he employed. Which of these shows a flaw in his report ?

A. Some CuO was reacted with excess dilute H₂SO₄
B. The solution was concentrated
C. When the concentrate was cooled, crystals formed were removed by filtration
D. The crystals were washed with very little cold water
E. The crystals were then allowed to dry

Question 28:

• JAMB 1983

30 cm³ of 0.1 M Al (NO₃)₃ SOLUTION IS RECTED WITH 100cm³ of 0.15M of NaOH solution. Which reactant is in excess, and by now much ?

A. NaOH solution by 70 cm³
B. NaOH solution, by 60 cm³
C. NaOH solution by 40 cm³
D. Al(NO₃)₃ solution by 20 cm³
E. Al(NO₃)₃ solution by 10 cm³

Question 29:

• JAMB 1983

In the above experiment, the litmus paper will initially

A. Be bleached
B. Turn green
C. Turn red
D. Turn blue
E. Turn black

Question 30:

• JAMB 1984

Which of the following mixtures would result in a solution of pH greater than 7?

A. 25.00 cm³ of 0.05 M H₂SO₄ and 25.00cm³ of 0.50 M Na₂CO₃
B. 25.00 cm³ of 0.05 M H₂SO₄ and 25.00 cm³ of 0.10 M NaHCO₃
C. 25.00 cm³ of 0.11 MH₂SO₄ and 25.00cm³ 0. 10 M NaOH
D. 25.00cm³ of 0.11 MH₂ SO₄ and 50.00 cm³ of 0.05 M NaOH
E. 25.00cm³ of 0.25 M H₂SO₄ and 50.00cm³ of 0.20 M NaOH