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
