Waec Chemistry 2004 Past Questions and Answers

Question 1:

• WAEC 2004

The mass of an element is 27 and its atomic number is 13. What is the composition of the nucleus of its atom?

A. 13 electrons and 14 protons
B. 13 neutrons and 14 protons
C. 13 protons and 14 neutrons
D. 13 electrons and 14 neutrons

Question 2:

• WAEC 2004

The mass of an element is 27 and its atomic number is 13. What is the composition of the nucleus of its atom?

A. 13 electrons and 14 protons
B. 13 neutrons and 14 protons
C. 13 protons and 14 neutrons
D. 13 electrons and 14 neutrons

Question 3:

• WAEC 2004

Which of the following electron transition results in the emission of energy?

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

Question 4:

• WAEC 2004

Which of the following properties of elements deceases generally across a period in the Periodic Table?

A. Electronegativy
B. Electron affinity
C. Atomic radluc
D. Lonlzation energy

Question 5:

• WAEC 2004

Which of the electrons in the following orbitals will experience the greatest nuclear attraction?

A. 1s electron of helium
B. 1s electron of potassium
C. 23 electron of boron
D. 2s electron of carbon