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

Question 6:

• JAMB 2019

200cm³ each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.
[Pb = 207, Cl= 35.5, N = 14, O = 16]

A. 2.78g
B. 5.56g
C. 8.34g
D. 11.12g
E. 16.45g

Question 7:

• JAMB 1978

In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?

A. 5cm³
B. 10cm³
C. 20cm³
D. 25cm³
E. 50cm³

Question 8:

• JAMB 1978

The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore

A. None of these solutions is acidic
B. The pH of Y is made more acidic by addition of distilled water
C. Z is the most acidic solution
D. W is the most acidic solution
E. X is neutral

Question 9:

• JAMB 1978

In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?

A. In the beaker
B. In the conical flask
C. In a burette
D. In the standard flask
E. In the measuring cylinder

Question 10:

• JAMB 1978

Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?

A. Litmus paper
B. Phenolphthalein
C. Methyl orange
D. Universal indicator
E. None of these