CHEM 121 MODULE 2 EXAM QUESTIONS AND ANSWERS
100% Verified Graded A+
1. 1. Which solution contains the largest number of moles of chloride ions?
A. 10.0 mL of 0.500 M BaCl2
B. 4.00 mL of 1.000 M NaCl
C. 7.50 mL of 0.500 M FeCl3
D. 25.00 mL of 0.400 M KCl
E. 30.00 mL of 0.100 M CaCl2
Answer: C. 7.50 mL of 0.500 M FeCl3
2. 2. Which one of the following substances is produced during the reaction of
an acid with a metal hydroxide?
A. H2
B. H2O
C. CO2
D. NaOH
E. O2
, Answer: B. H2O
3. 3. Which reaction described below is an oxidation-reduction reaction?
A. Ice melting in a soft drink
B. Table salt dissolving in water for cooking vegetables
C. Rusting of iron
D. The reaction of sodium chloride with lead nitrate to form lead chloride and
sodium nitrate
E. Neutralization of HCl by NaOH
Answer: C. Rusting of iron
4. 4 When aqueous solutions of Pb(NO3)2 and NaCl are mixed, lead(II) chloride
precipitates. The balanced net ionic equation is .
A. Pb2+ (aq) + 2Cl- (aq) ’PbCl2 (s)
B. Pb2+ (aq) + 2NO3 - (aq) ’Pb(NO3)2 (s)
C. Pb2+ (aq) + 2NO3 - (aq) ’Pb(NO3)2 (aq)
D. Pb(NO3)2 (aq) + 2NaCl (aq) ’PbCl2 (s) + 2NaNO3 (aq)
E. Pb(NO3)2 (aq) + 2NaCl (aq) ’PbCl2 (aq) + 2NaNO3 (s)
Answer: A. Pb2+ (aq) + 2Cl- (aq) ’PbCl2 (s)
5. 5. Oxidation cannot occur without .
100% Verified Graded A+
1. 1. Which solution contains the largest number of moles of chloride ions?
A. 10.0 mL of 0.500 M BaCl2
B. 4.00 mL of 1.000 M NaCl
C. 7.50 mL of 0.500 M FeCl3
D. 25.00 mL of 0.400 M KCl
E. 30.00 mL of 0.100 M CaCl2
Answer: C. 7.50 mL of 0.500 M FeCl3
2. 2. Which one of the following substances is produced during the reaction of
an acid with a metal hydroxide?
A. H2
B. H2O
C. CO2
D. NaOH
E. O2
, Answer: B. H2O
3. 3. Which reaction described below is an oxidation-reduction reaction?
A. Ice melting in a soft drink
B. Table salt dissolving in water for cooking vegetables
C. Rusting of iron
D. The reaction of sodium chloride with lead nitrate to form lead chloride and
sodium nitrate
E. Neutralization of HCl by NaOH
Answer: C. Rusting of iron
4. 4 When aqueous solutions of Pb(NO3)2 and NaCl are mixed, lead(II) chloride
precipitates. The balanced net ionic equation is .
A. Pb2+ (aq) + 2Cl- (aq) ’PbCl2 (s)
B. Pb2+ (aq) + 2NO3 - (aq) ’Pb(NO3)2 (s)
C. Pb2+ (aq) + 2NO3 - (aq) ’Pb(NO3)2 (aq)
D. Pb(NO3)2 (aq) + 2NaCl (aq) ’PbCl2 (s) + 2NaNO3 (aq)
E. Pb(NO3)2 (aq) + 2NaCl (aq) ’PbCl2 (aq) + 2NaNO3 (s)
Answer: A. Pb2+ (aq) + 2Cl- (aq) ’PbCl2 (s)
5. 5. Oxidation cannot occur without .
