# 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.

11. The oxidation number of nitrogen in $$Pb(NO_{3})_{2}$$ is

• A. +2
• B. +3
• C. +4
• D. +5

12. Which of the following arrangements indicates the correct decreasing order of ionization energy of period 3 elements?

• A. Na, Al, P, Cl
• B. Cl, P, Al, Na
• C. Na, P, Cl, Al
• D. Al, Na, P, Cl

13. Which of the following metals has the strongest metallic bond?

• A. $$_{13}Al$$
• B. $$_{19}K$$
• C. $$_{12}Mg$$
• D. $$_{11}Na$$

14. Which of the following substances does not have van der Waals’ forces?

• A. Copper
• B. Graphite
• C. Neon
• D. Iodine crystals

15.  The oxidation number of X in $$XO_{4}^{3+}$$ is

• A. +1
• B. +3
• C. +4
• D. +5

16. The ionization energy is affected by the following factors except

• A. distance of the outermost electron(s) from the nucleus
• B. size of the positive nuclear charge
• C. ability to attract shared electron(s)
• D. screening effect of the inner electron(s)

17. Which of the following statements is correct?

• A. Covalent compounds would readily ionize in solution
• B. Covalent compounds consist of ions
• C. Hydrogen bond is formed between a metal and a non-metal
• D. Ionic compounds in solution would conduct electricity

18. The bond angle in tetrahedral molecules such as tetrachloromethane is

• A. 180.0°
• B. 109.5°
• C. 105.5°
• D. 90.0°

19. The properties of a good primary standard include the following except

• A. high molecular mass
• B. low molecular mass
• C. high degree of purity
• D. readily available

20. The use of diamond in abrasives is due to its

• A. high melting point
• B. hardness
• C. octahedral shape
• D. durability

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