Jamb Chemistry 2019 Past Questions and Answers

Question 76:

• JAMB 2019

When chlorine water is exposed to bright sunlight, the following products are formed

A. HCl\(_{(aq)}\) and Cl\(_2\)
B. HOCl\(_{(aq)}\) and Cl\(_2\)
C. HCl\(_{(aq)}\) and O\(_2\)
D. HOCl\(_{(aq)}\) and O\(_2\)

Question 77:

• 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 78:

• JAMB 2019

Which of the following is a set of neutral oxides?

A. N\(_2\)O, H\(_2\)O, CO
B. N\(_2\)O, SO\(_2\), CO
C. N\(_2\)O, Na\(_2\)O, ZnO
D. N\(_2\)O, SO\(_3\), NO

Question 79:

• JAMB 2019

SO\(_3\) is not directly dissolved in water in the industrial preparation of H\(_2\)SO\(_4\) by the contact process because

A. SO\(_3\) is an acidic gas
B. Acid is usually added to water and not water to acid
C. The reaction between SO\(_3\) and water is violently exothermic
D. SO\(_3\) does not dissolve readily in water

Question 80:

• JAMB 2019

Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region

A. Which contains protons and neutrons
B. Which is positively charged
C. Which is massive and can cause deflection of a few projectiles
D. Which is very large and in which close to 98% of projectiles pass undeflected