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

Question 181:

• JAMB 2018

Calculate the pH of 0.05 moldm\(^{-3}\) H\(_2\)SO\(_4\)

A. 1.30
B. 1.12
C. 1.00
D. 0.30

Question 182:

• JAMB 2018

The hydrogen ion concentration of a sample of orange juice is 2.0 X 10\(^{-11}\)moldm\(^{-3}\). What is its p\(^{OH}\)? [log102 = 0.3010]

A. 3.30
B. 13.00
C. 10.70
D. 11.30

Question 183:

• JAMB 2018

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment

A. The litmus turns blue but no gas is evolved
B. The litmus turns blue and oxygen is evolved
C. The litmus turns blue and hydrogen is evolved
D. The litmus turns red and oxygen is evolved

Question 184:

• JAMB 2019

Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?

A. Chlorine attacks the starch to give the blue-black color
B. Chlorine attacks the iodide ion to give the blue-black color
C. Chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color
D. Iodine attacks the starch to give the blue-black color

Question 185:

• JAMB 2019

Na\(_2\)CO\(_3\) + 2HCl \(\to\) 2NaCl + H\(_2\)O + CO\(_2\)
The indicator most suitable for this reaction should have a pH equal to

A. 5
B. 7
C. 3
D. 9