Waec Chemistry 2011 Past Questions and Answers

Question 1:

• WAEC 2011

How many isotopes has hydrogen?

A. 2
B. 3
C. 4
D. 5

Question 2:

• WAEC 2011

How many isotopes has hydrogen?

A. 2
B. 3
C. 4
D. 5

Question 3:

• WAEC 2011

Which of the following electrons configurations correctly represents an inert element?

A. 1s²2s²2p⁴
B. 1s²2s²2p⁶3s²
C. 1s²2s²2p⁶3s²3p⁴
D. 1s²2s²2p⁶

Question 4:

• WAEC 2011

What type of reaction is represented by the following equation?\(\frac{2}{1}\)D\(\frac{3}{1}\)H → \(\frac{4}{4}\)He + \(\frac{1}{0}\)n + energy

A. Nuclear fission
B. Nuclar fusion
C. Radioactive decay
D. Spontaneous decay

Question 5:

• WAEC 2011

Which of the following ions has the electron configuration 2,8,8?

A. Na⁺
B. Mg²⁺
C. F^-
D. CI^-