1. The conjugate base of acetic acid (CH3COOH) is ….
a. CH3COO-
b. CH3COOH2+
c. CH2COO2-
d. CHCOO3-
e. CCOOH2-
2. The conjugate acid of the weak base methylamine (CH3NH2) is ….
a. CH3N2-
b. CH3NH-
c. CH3NH3+
d. CH3NH3-
e. CH3NH42+
3. The sunscreen agent, para-aminobenzoic acid (C7H7NO2) can act as a base. What is the conjugate acid of this compound?
a. C7H8NO2
b. C7H8NO2+
c. C7H7NO2)-
d. C7H8NO2-
e. C7H7NO2+
4. Urea (CON2H4) is a base. What is its conjugate acid?
a. CON2H5
b. CON2H5+
c. CON2H3-
d. CON2H3+
e. CON2H5-
5. Hydrazine (N2H4), formerly used as a rocket fuel, is a base. What is its conjugate acid?
a. N2H4-
b. N2H5+
c. N2H3+
d. N2H5
e. N2H5-
6. In terms of base strength, OH- is … CH3COO-.
a. stronger than
b. weaker than
c. the same as
d. different with
7. Which definition of an acid is more restrictive? In other words, which definition includes fewer substances in its definition of an acid?
a. Arrhenius
b. Brønsted-Lowry
c. Lewis
d. Arrhenius and Bronsted-Lowry
e. Arrhenius and Lewis
8. Conjugate acid-base pair is ….
a. an acid and base that react to form water
b. a pair of acids with similar structures
c. two substances related by the donation/acceptance of a proton
d. two substances that have the same acid-base effect in water.
9. Which of the following pairs does not represent a conjugate acid-base pair?
a. HClO4 / ClO4-
b. HCl / Cl-
c. H2SO4 / SO42-
d. H2O / OH-
e. NH3 / NH4+
10. Identify the Brønsted-Lowry acids and bases (conjugate pairs) in the following equation. (A= B-L acid; B= B-L base)
HC2H3O2 + CN- = HCN + C2H3O2–
a. B A B A
b. B B A A
c. A B A B
d. A B B A
e. B A A B
11. The conjugate of a weak base is …
a. a strong base
b. a weak base
c. a strong acid
d. a weak acid
e. None of these
12. Which of these is the weakest conjugate base?
a. NH2– d. Cl-
c. C2H3O2– e. CN-
e. SO42–
13. Sunscreen agents contain para-aminobenzoic acid (C7H7NO2). What is the conjugate base of this acid?
a. C7H8NO2+
b. C7H7NO2-
c. C7H8NO2-
d. C7H6NO2+
e. C7H6NO2-
14. Oxalic acid (C2H2O4) is found in rhubarb and spinach. What is its conjugate base?
a. C2HO4+
b. C2H3O4
c. C2H3O4-
d. C2H3O4+
e. C2HO4-
15. What is the conjugate acid of aniline, C6H5NH2?
a. C6H5NH2+
b. C6H5NH3-
c. C6H5NH-
d. C6H5NH2-
e. C6H5NH3+
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