Sample Questions - Chapter 4

Types of Chemical Reactions

Examples of
Multiple Choice Questions

1.: What alkaline earth metal is located in period 3?; (a) Li; (b) Na; (c) Ca; (d) Mg; (e) Sr
2.: Which of the following is classified as a metal?; (a) Ge; (b) As; (c) F; (d) V; (e) Ar
3.: Which of the following is a weak acid?; (a) H₂SO₄; (b) HClO₃; (c) HF; (d) HCl; (e) HNO₃
4.: Which one of the following is likely to be the most soluble base?; (a) Ca(OH)₂; (b) Cu(OH)₂; (c) Ga(OH)₃; (d) Zn(OH)₂; (e) Zr(OH)₃
5.: Which one of the following statements is TRUE?; (a) One mole of any acid will ionize completely in aqueous solution to produce one mole of H⁺ ions.; (b) Solutions of weak acids always have lower concentrations of H⁺ than solutions of strong acids.; (c) There are several common acids that are insoluble.; (d) All of the IA and IIA metal hydroxides are soluble.; (e) All weak acids are insoluble.
6.: Consider the following reaction:
NH₃(g) + H₂O(l) NH₄⁺(aq) + OH^-(aq) Which one of the following statements is false?; (a) The double arrows indicate that ammonia, NH₃, is only very slightly soluble in water.; (b) The reaction is reversible.; (c) When ammonia is added to water, NH₄⁺ and OH^- ions are produced in a 1:1 ratio.; (d) When solutions of NH₄Cl and NaOH are mixed, some ammonia is produced.; (e) Ammonia is considered to be a weak base.
7.: Which one of the following salts is insoluble?; (a) NH₄Cl; (b) Ca(NO₃)₂; (c) BaCO₃; (d) Na₂S; (e) Zn(CH₃COO)₂
8.: What salt is formed in the following acid/base reaction?
HClO₃ + Ba(OH)₂; (a) BaCl₂; (b) ClOBa; (c) H₂O; (d) BaClO₃; (e) Ba(ClO₃)₂
9.: The precipitate formed when barium chloride is treated with sulfuric acid is _______ .; (a) BaS₂O₄; (b) BaSO₃; (c) BaSO₂; (d) BaSO₄; (e) BaS
10.: The spectator ion(s) in the following reaction is/are:
Na₂CO₃(aq) + Ba(NO₃)₂(aq) BaCO₃(s) + 2NaNO₃(aq); (a) Na⁺ and Ba²⁺; (b) Ba²⁺ and CO₃^2-; (c) CO₃^2- and NO₃^-; (d) Na⁺ only; (e) Na⁺ and NO₃^-
11.: Which one of the following statements is FALSE?; (a) For the reaction of a strong acid with a strong soluble base, the net ionic equation is always
H⁺ + OH^- H₂O; (b) "Spectator ions" appear in the total ionic equation for a reaction, but not in the net ionic equation.; (c) HF, HCl, and HNO₃ are all examples of strong acids.; (d) Titration is a process which can be used to determine the concentration of a solution.; (e) In a neutralization reaction, an acid reacts with base to produce a salt and H₂O.
12.: What is the net ionic equation for the acid-base reaction that occurs when acetic acid and potassium hydroxide solutions are mixed?; (a) H⁺(aq) + OH^-(aq) H₂O(l); (b) H⁺(aq) + KOH(s) K⁺(aq) + H₂O(l); (c) CH₃COOH(aq) + KOH(s) KCH₃COO(aq) + H₂O(l); (d) CH₃COO^-(aq) + H⁺(aq) + K⁺(aq) + OH^-(aq) K⁺(aq) + CH₃COO^-(aq) + H₂O(l); (e) CH₃COOH(aq) + OH^-(aq) CH₃COO^-(aq) + H₂O(l)
13.: What is the net ionic equation for the acid-base reaction that occurs when nitric acid is added to copper(II) hydroxide?; (a) H⁺(aq) + OH^-(aq) H₂O(l); (b) 2H⁺(aq) + Cu(OH)₂(s) Cu²⁺(aq) + 2H₂O(l); (c) 2HNO₃(aq) +Cu(OH)₂(s) Cu(NO₃)₂(s) + 2H₂O(l); (d) 2H⁺(aq) + 2NO₃^-(aq) + Cu²⁺(aq) + 2OH^-(aq) Cu(NO₃)₂(s) + 2H₂O(l); (e) 2H⁺(aq) + 2NO₃^-(aq) + Cu²⁺(aq) + 2OH^-(aq) Cu²⁺(aq) + 2NO₃^-(aq) + 2H₂O(l)
14.: Which of the following statements is FALSE given the following net ionic equation?
H₃PO₄(aq) + 3OH^-(aq) PO₄^3-(aq) + 3H₂O(l); (a) If all the water evaporated away, the salt remaining could possibly be Na₃PO₄.; (b) The acid, H₃PO₄, is a weak electrolyte.; (c) The base involved must be a strong soluble base.; (d) This is classified as a neutralization reaction.; (e)This could be the net ionic equation for H₃PO₄ reacting with Al(OH)₃.
15.: Which of the following statements is FALSE given the following net ionic equation?
2H⁺(aq) + Cu(OH)₂(s) Cu²⁺(aq) + 2H₂O(l); (a) If all the water evaporated away, the salt remaining could possibly be CuS.; (b) The acid involved must be a strong electrolyte.; (c) The base, Cu(OH)₂, is an insoluble base.; (d) This could be the net ionic equation for HNO₃ reacting with Cu(OH)₂.; (e) This is classified as a neutralization reaction.
16.: Determine the oxidation number of carbon in K₂CO₃.; (a) 0; (b) +2; (c) +4; (d) -2; (e) some other value
17.: Which assignment of oxidation number is INCORRECT for the blinking element?; (a) K₂Cr₂O₇; +6; (b) NH₃; +3; (c) H₂PO₂^-; +1; (d) SeO₃^2-; +4; (e) Cu(NO₃)₂; +2
18.: Consider the following reaction:
4NH₃ + 5O₂ 4NO + 6H₂O The element being oxidized and the oxidizing agent are:; (a) N and NH₃; (b) N and O₂; (c) O and NH₃; (d) O and O₂; (e) H and NH₃
19.: Given that the Activity Series is: Na>Mg>Cu>Ag>Au, which one of the following answers represents the ions that would not be displaced from aqueous solution (reduced) by metallic magnesium?; (a) Na⁺; (b) Cu²⁺; (c) Cu²⁺ and Au⁺; (d) Cu²⁺, Ag⁺ and Au⁺; (e) Na⁺, Cu²⁺, Ag⁺ and Au⁺
20.: Which name/formula combination is WRONG?; (a) phosphorous acid / H₃PO₄; (b) nitrogen oxide / NO; (c) acetate ion / CH₃COO^-; (d) sodium chromate / Na₂CrO₄; (e) calcium hypobromite / Ca(BrO)₂
21.: Which name/formula combination is WRONG?; (a) chlorous acid / HClO₂; (b) dinitrogen tetroxide / N₂O₄; (c) ammonium nitrate / NH₄NO₃; (d) copper(II) periodate / CuIO₄; (e) potassium permanganate / KMnO₄

Answers:

1. (d) 2. (d) 3. (c) 4. (a) 5. (b) 6. (a) 7. (c) 8. (e) 9. (d) 10. (e) 11. (c) 12. (e) 13. (b) 14. (e) 15. (a) 16. (c) 17. (b) 18. (b) 19. (a) 20. (a) 21. (d)

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