Lesson: Chapter - 6

Electrochemistry Practice Questions

1. What is the sum of the coefficients of the following equation when it is balanced? Al2(SO4)3 + Ca(OH)2 ? Al(OH)3 + CaSO4
(A) 5
(B) 6
(C) 7
(D) 8
(E) 9
2. Indium reacts with bromine to form InBr3. In the balanced equation for this reaction, the coefficient of the indium (III) bromide is
(A) 1
(B) 2
(C) 3
(D) 4
(E) 6


3. When the following equation is balanced, what is the sum of the coefficients?

Al2(CO3)3 + Mg(OH)2 ? Al(OH)3 + MgCO3

(A) 3

(B) 4

(C) 8

(D) 9

(E) 10
4. The balanced net ionic equation for the reaction of aluminum sulfate and sodium hydroxide contains which of the following terms?
(A) 3Al3+(aq)
(B) OH-(aq)
(C) 3OH-(aq)
(D) 2Al3+(aq)
(E) 2Al(OH)3(s)
5. When solutions of phosphoric acid and iron (III) nitrate react, which of the following terms will be present in the balanced molecular equation?
(A) HNO3(aq)
(B) 3HNO3(aq)
(C) 2FePO4(s)
(D) 3FePO4(s)
(E) 2HNO3(aq)
6. Statement I Statement II
The conjugate base of a weak acid is a strong base. BECAUSE   Elements that are strong Bronsted-Lowry acids are not strong Bronsted-Lowry bases.
7. In solution, which of the following has the greatest [H3O+]?
(A) HCN
(B) HNO3
(C) H2O
(D) OH-
(E) CH3OH
8. Which of the following is not true for a solution at 25ºC that has a hydroxide concentration of 1.0 × 10-6 M?
(A) Kw = 1 × 10-14
(B) The solution is acidic.
(C) The solution is basic.
(D) The [H+] is 1 × 10-8 M.
(E) The pOH equals 6.0.
9. Which of the following would produce a basic aqueous solution?
(A) SO2
(B) KCl
(C) CO2
(D) NH4Cl
(E) Na2O
10. Equimolar solutions of which of the following would produce the most acidic solution?
(A) H3PO4
(B) HClO
(C) HClO2
(D) HClO3
(E) HClO4
11. In which of the following substances would nitrogen have the highest oxidation number?
(A) NO
(B) N2O
(C) NO2
(D) N2O4
(E) NO3-
12. Statement I Statement II
Voltaic cells harness the energy of redox reactions. BECAUSE   In a voltaic cell, electron flow occurs through the salt bridge.
13. Statement I Statement II
Electrolytic cells require the input of energy. BECAUSE   Electrolytic cells have just one container, while voltaic cells have two.
14. Which of the following half-cell reactions describes what is happening at the anode in the diagram?
(A) Zn? Zn2+ + 2e-
(B) H2? 2H+ + 2e-
(C) 2Cl-?Cl2 + 2e-
(D) SO4-?S + 2O2 + 6e-
(E) 2H+ + 2e-?H2
15. Given the following chemical reaction for the formation of lithium oxide, which of the following statements is true?
4Li(s) + O2(g) ? 2Li2O(s)
(A) Lithium metal is the oxidizing agent.
(B) Oxygen gas is the reducing agent.
(C) Lithium is oxidized.
(D) Oxygen is oxidized.
(E) Oxygen loses two electrons to become a -2 ion.
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