Waec Chemistry 2009 Past Questions and Answers

Question 6:

• WAEC 2009

How many orbitals are associated with the p-sub energy level?

A. 2
B. 3
C. 5
D. 6

Question 7:

• WAEC 2009

Which of the following elements has the electronic configuration:1s²2s²2p⁶3s²3p¹? [₁₁Na, ₁₃A1,₁₄N,₁₆S]

A. Al
B. Na
C. N
D. S

Question 8:

• WAEC 2009

The following properties are characteristics of transition elements except

A. Formation of complex ions
B. Fixed oxidation states
C. Formation of coloured compounds
D. Catalytic abilities

Question 9:

• WAEC 2009

Which of the following ions is isoelectronic with neon? [₃Li, _{3F, [sub]10}Ne, ₁₇CI,₁₉K]
[/sub]

A. CI^-
B. F^-
C. K⁺
D. Li,⁺

Question 10:

• WAEC 2009

Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?

A. 1s² 2s² 2p²
B. 1s² 2s² 2p⁶
C. 1s² 2s² 2p⁶ 3s² 3p⁴
D. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹