Jamb Chemistry Past Questions and Answers

Question 2081:

• 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 2082:

• 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 2083:

• 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 2084:

• 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 2085:

• 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