# Chemistry 2017 Past Questions | WAEC

Study the following Chemistry past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

1. Which of the following species determines the chemical properties of an atom?

• A. Electron
• B. Neutron
• C. Nucleus
• D. Proton

2. The following glasswares are used to measure the volume of liquids EXCEPT

• B. pipette
• C. test tube
• D. burette

3. Pauli exclusion principle is related to

• A. quantity of electrons in the valence shell
• B. filling the orbitals with lower energy first
• C. the filling of degenerated orbitals
• D. quantum numbers of electrons

4. The species with no electron in the 3d-orbital is

• A. $$Zn^{2+}$$
• B. $$Sc^{3+}$$
• C. Cu
• D. $$Mn$$

5. The seperation of Nitrogen from oxygen using fractional distillation of air is possible because

• A. nitrogen is less dense than oxygen
• B. oxygen is more reactive than nitrogen
• C. of the difference in their boiling points
• D. they belong to the same period

6. The purity of a solid sample can best be determined by its

• A. boiling point
• B. melting point
• C. conductivity
• D. solubility

7.  The mass of one mole of $$(NH_{4})_{2}CO_{3}$$ is   [O=16.0, N=14.0, C=12.0, H=1.0]

• A. 66.0g
• B. 76.0g
• C. 80.0g
• D. 96.0g

8.  Atomic orbital is

• A. the circular path through which electrons revolve round the nucleus
• B. a region around the nucleus where electrons are most likely to be found
• C. the path around the nucleus through which electrons move
• D. the path around the nucleus through which protons move

9. The property of elements which increases down a group of the periodic table is

• A. electronegativity
• B. electron affinity
• D. ionization energy

10. The reason for the decrease in the atomic size of elements across a period is that

• A. nuclear charge increases while the outermost electrons are drawn closer to the nucleus
• B. nuclear charge decreases while the outermost electrons are drawn closer to the nucleus
• C. valence electrons increase across the period while the valence shell remains constant
• D. nuclear charge decreases while the distance of the valence shell from the nucleus is increasing

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