Jamb Chemistry 2019 Past Questions and Answers

Question 96:

• JAMB 2019

The molecular shape and bond angle of water are respectively

A. Linear, 180°
B. Bent, 109.5°
C. Tetrahedral, 109.5°
D. Bent, 105°

Question 97:

• 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

Question 98:

• JAMB 2019

A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

A. 75,000 particles
B. 35,000 particles
C. 25,000 particles
D. 50,000 particles

Question 99:

• JAMB 2019

Which two gases can be used for the demonstration of the fountain experiment?

A. SO\(_3\) and NH\(_3\)
B. SO\(_2\) and NH\(_3\)
C. HCl and NH\(_3\)
D. SO\(_2\) and HCl

Question 100:

• JAMB 2019

Which of the following pollutants will lead to the depletion of ozone layer?

A. Chlorofluorocarbon
B. Carbon (ii) oxide
C. Hydrogen sulphide
D. Sulphur (iv) oxide