Waec Chemistry Past Questions For Year 2010
Question 1
The energy change which accompanies the addition of an electron to a gaseous atom is
- A. atomization
- B. electron affinity
- C. electronegativity
- D. ionization
Question 2
Which of the following equations represents beta decay?
- A. \(\frac{14}{7}\)N + \(\frac{4}{2}\)He → \(\frac{8}{17}\)O + \(\frac{1}{1}\)H
- B. \(\frac{8238}{92}\)U → \(\frac{234}{90}\)Th + \(\frac{4}{2}\)He
- C. \(\frac{8238}{92}\)U → \(\frac{239}{93}\)Np + \(\frac{0}{-1}\)e
- D. \(\frac{13}{7}\)N + \(\frac{4}{2}\)He → \(\frac{16}{8}\)O + \(\frac{1}{1}\)H
Question 3
A solid substance with high melting and boiling points is likely to be a/an
- A. covalent compound
- B. dative covalent compound
- C. electrovalent compound
- D. non-metal
Question 4
Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?
- A. 10M 3+
- B. 10M 3-
- C. 13M 3+
- D. 13M 3-
Question 5
If X is a group lll element, its oxide would be represented as
- A. X3O2
- B. X3O
- C. X2O3
- D. XO3
