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

Question 41:

• JAMB 1986

Which of the following is an acidic salt?

A. NaHSO₄
B. Na₂SO₄
C. CH₃CO₂Na
D. Na₂S

Question 42:

• JAMB 1986

Which of the following solutions will conduct the least amount of electricity?

A. 2.00 M aqueous solution of NaOH
B. 0.01 M aqueous solution of NaOH
C. 0.01 M aqueous solution of hexanoic acid
D. 0.01 M aqueous solution of sugar

Question 43:

• JAMB 1986

The tabulated results below were obtained by titration 10.0 cm₃ of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is

A. 1.5
B. 1.4
C. 4.1
D. 5.1

Question 44:

• JAMB 1987

The best treatment for a student who accidentally poured concentrated tetraoxosulphate (VI) acid on his skin in the laboratory is to wash the skin with?

A. Cold water
B. Sodium hydroxide solution
C. Iodine solution
D. Sodium trioxocarbonate (IV) solution

Question 45:

• JAMB 1987

The times taken for iodine to be liberated in the reaction between sodium thiosulphate and hydrochloric acid at various temperature are as follows. These results suggest that

A. For a 10^o rise in temperature, rate of reaction is double
B. For a 10 ^o rise in temperature, rate of reaction is halved
C. Time taken for iodine to appear does not depend on temperature
D. For a 10 ^o rise in temperature rate of reaction is tripled