Waec Chemistry 2010 Past Questions and Answers

Question 1:

• WAEC 2010

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 2:

• WAEC 2010

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:

• WAEC 2010

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 4:

• WAEC 2010

Which of the following elements is a d-block element?

A. Calcium
B. Lron
C. Lithium
D. Silicon

Question 5:

• WAEC 2010

Which of the following statements about chlorine and iodine at room temperature is correct?

A. Chlorine is gas and iodine is solid
B. Chlorine is liquid and iodine is gas
C. Chlorine and iodine are gases
D. Chlorine is solid and iodine is liquid