2020-2024 WAEC Chemistry questions about 1. Radioactivity 2. Shapes of molecules?

Ramourbee

1 year ago

Here are some sample WAEC Chemistry questions from 2020 to 2024 on Radioactivity and Shapes of Molecules:

# Radioactivity
1. What is the process by which an unstable nucleus loses energy and stability? (2020)
2. Which type of radiation has the highest ionizing power? (2020)
A) Alpha
B) Beta
C) Gamma
3. What is the half-life of a radioactive substance? (2021)
4. Which of the following statements about radioactivity is correct? (2022)
A) Radioactivity is a property of all elements.
B) Radioactivity is a property of only heavy elements.
C) Radioactivity is a property of only light elements.
5. What is the difference between nuclear fission and nuclear fusion? (2023)

# Shapes of Molecules
1. What is the shape of the molecule CO2? (2020)
A) Linear
B) Bent
C) Trigonal planar
2. Which of the following molecules has a tetrahedral shape? (2020)
A) CH4
B) NH3
C) H2O
3. What is the bond angle in a molecule with a trigonal planar shape? (2021)
4. Which of the following statements about molecular shape is correct? (2022)
A) The shape of a molecule is determined by the number of electrons in the outermost energy level.
B) The shape of a molecule is determined by the number of protons in the nucleus.
C) The shape of a molecule