Waec Chemistry 2013 Past Questions and Answers

Question 6:

• WAEC 2013

Which of the following statements is correct?

A. Atomic size decreases down the group
B. Atomic size increases across the period
C. Anions are smaller than the parent atom
D. Cations are smaller than the parent atom

Question 7:

• WAEC 2013

Which of the following arrangements represents the correct order of electronic energy level?

A. 1s 2p 2s 3p 3s 3d 4s
B. 1s 2s 2p 3s 3p 3d 4s
C. 1s 2s 2p 3s 3p 4s 3d
D. 1s 2s 3s 2p 3p 4s 3d

Question 8:

• WAEC 2013

The element with electron configuration 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\) belongs to

A. S-block period 3, group 1
B. P-block, period 3, group 2
C. S-block, period 3, group 3
D. P-block, period 3, group 3

Question 9:

• WAEC 2013

In the periodic table all elements within the same group have the same

A. Number of neutrons
B. Number of valence electrons
C. Number of isotopes
D. Atomic number

Question 10:

• WAEC 2013

Which of the following halogens is liquid at room temperature?

A. Lodine
B. Chlorine
C. Bromine
D. Fluorine