Question 1

Which of the following represents a disproportionation reaction?

Accepted Answer

A) Br2(l)+ H2O(l)→ HOBr(aq)+ Br-(aq)+ H+(aq) 
B) S(s)+ SO2(g)+ H2O(l)→ S2O32-(aq)+ 2 H+(aq)  
C) HOCl(aq)+ OH-(aq)→ H2O(l)+ OCl-(aq)  
D) 3 S2-(aq)+ 2 CrO42-(aq)+ 8 H2O(l)→ 3 S(s)+ 2 Cr(OH)3(s)+ 10 OH-(aq) 
E) HF(aq)→ H+(aq)+ F-(aq)  
A) Br2(l)+ H2O(l)→ HOBr(aq)+ Br-(aq)+ H+(aq) 
B) S(s)+ SO2(g)+ H2O(l)→ S2O32-(aq)+ 2 H+(aq)  
C) HOCl(aq)+ OH-(aq)→ H2O(l)+ OCl-(aq)  
D) 3 S2-(aq)+ 2 CrO42-(aq)+ 8 H2O(l)→ 3 S(s)+ 2 Cr(OH)3(s)+ 10 OH-(aq) 
E) HF(aq)→ H+(aq)+ F-(aq)  A

Question 2

In which of the following pairs is the oxidation number for the underlined element INCORRECT?

Accepted Answer

A) MnO2/(+4 ) 
B) SO32-/(+4) 
C) ClO3-/(+7) 
D) NO2-/(+3) 
E) Cr2O3/(+3) 
A) MnO2/(+4 ) 
B) SO32-/(+4) 
C) ClO3-/(+7) 
D) NO2-/(+3) 
E) Cr2O3/(+3) C

Question 3

Which of the following represents a neutralization reaction?

Accepted Answer

A) 2 H2(g)+ O2(g)→ 2 H2O(l) 
B) NH3(aq)+ HCl(aq)→ NH4Cl(aq) 
C) 2 NaOH(aq)+ CuCl2(aq)→ 2 NaCl(aq)+ Cu(OH)2(s) 
D) HBr(aq)+ AgNO3(aq)→ HNO3(aq)+ AgBr(s) 
E) 2 H2O2(aq)→ 2 H2O(l)+ O2(g) 
A) 2 H2(g)+ O2(g)→ 2 H2O(l) 
B) NH3(aq)+ HCl(aq)→ NH4Cl(aq) 
C) 2 NaOH(aq)+ CuCl2(aq)→ 2 NaCl(aq)+ Cu(OH)2(s) 
D) HBr(aq)+ AgNO3(aq)→ HNO3(aq)+ AgBr(s) 
E) 2 H2O2(aq)→ 2 H2O(l)+ O2(g) B

Question 4

Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride:   (aq)+   (aq)→ AgCl(s)
Silver chloride is virtually insoluble in water so that the reaction appears to go to completion.How many grams of solid NaCl must be added to 25.0 mL of 0.366 mol L-1   (aq)solution to completely precipitate the silver?

Accepted Answer

A) 9.15 ×   g 
B) 1.57 × 10-4 g 
C) 0.535 g 
D) 0.157 g 
E) 6.39 × 103 g 
A) 9.15 ×   g 
B) 1.57 × 10-4 g 
C) 0.535 g 
D) 0.157 g 
E) 6.39 × 103 g

Question 5

Gold does not react with either nitric acid or hydrochloric acid but with a combination of both called aqua regia.Identify the oxidizing agent in the following equation:
Au(s)+ 4 H+(aq)+ NO3-(aq)+ 4 Cl-(aq)→ [AuCl4]-(aq)+ 2 H2O(l)+ NO(g)

Accepted Answer

A) Au 
B) H+ 
C) NO3-  
D) Cl-  
E) NO3- and H+ 
A) Au 
B) H+ 
C) NO3-  
D) Cl-  
E) NO3- and H+

Question 6

Which of the compounds H2C2O4,Ca(OH)2,KOH,and HI behave as bases when they are dissolved in water?

Accepted Answer

A) Ca(OH)2 and KOH 
B) H2C2O4 and HI 
C) only HI 
D) only KOH 
A) Ca(OH)2 and KOH 
B) H2C2O4 and HI 
C) only HI 
D) only KOH

Question 7

Identify the reducing agent in the following reaction:
2 NO2(g)+ 7 H2(g)→ 2 NH3(g)+ 4 H2O(g)

Accepted Answer

A) NO2  
B) NH3  
C) H2O 
D) H2  
E) There is no reducing agent. 
A) NO2  
B) NH3  
C) H2O 
D) H2  
E) There is no reducing agent.

Question 8

Which one of the following compounds is soluble in water?

Accepted Answer

A) Cu3(PO4)2 
B) CoS 
C) Pb(NO3)2 
D) ZnCO3 
A) Cu3(PO4)2 
B) CoS 
C) Pb(NO3)2 
D) ZnCO3

Question 9

When 280 mL of 1.50 × 10-4 mol L-1 hydrochloric acid is added to 105 mL of 1.75 × 10-4 mol L-1 Mg(OH)2,the resulting solution will be:

Accepted Answer

A) acidic 
B) basic 
C) neutral 
D) It is impossible to tell from the information given. 
A) acidic 
B) basic 
C) neutral 
D) It is impossible to tell from the information given.

Question 10

The mixing of which pair of reactants will result in a precipitation reaction?

Accepted Answer

A) CsI(aq)+ NaOH(aq) 
B) HCl(aq)+ Ca(OH)2(aq) 
C) K2SO4(aq)+ Hg2(NO3)2(aq) 
D) NaNO3(aq)+ NH4Cl(aq) 
A) CsI(aq)+ NaOH(aq) 
B) HCl(aq)+ Ca(OH)2(aq) 
C) K2SO4(aq)+ Hg2(NO3)2(aq) 
D) NaNO3(aq)+ NH4Cl(aq)

Question 11

Choose the INCORRECT statement.

Accepted Answer

A) Most molecular compounds are either nonelectrolytes or weak electrolytes. 
B) Most ionic compounds are strong electrolytes. 
C) A precipitate is formed when certain anions and cations react to form an insoluble ionic solid. 
D) Net ionic equations include only the actual participants of the reaction. 
E) An acid produces hydride ions in solution. 
A) Most molecular compounds are either nonelectrolytes or weak electrolytes. 
B) Most ionic compounds are strong electrolytes. 
C) A precipitate is formed when certain anions and cations react to form an insoluble ionic solid. 
D) Net ionic equations include only the actual participants of the reaction. 
E) An acid produces hydride ions in solution.

Question 12

Weak acids almost completely dissociate.

Accepted Answer

A) True 
 B)False

Question 13

The mixing of which pair of reactants will result in a precipitation reaction?

Accepted Answer

A) Ba(NO3)2(aq)+ Na2CO3(aq) 
B) K2SO4(aq)+ Cu(NO3)2(aq) 
C) NaClO4(aq)+ (NH4)2S(aq) 
D) NH4Br(aq)+ NH4I(aq) 
A) Ba(NO3)2(aq)+ Na2CO3(aq) 
B) K2SO4(aq)+ Cu(NO3)2(aq) 
C) NaClO4(aq)+ (NH4)2S(aq) 
D) NH4Br(aq)+ NH4I(aq)

Question 14

The substance KOH is a:

Accepted Answer

A) weak acid 
B) salt 
C) weak base 
D) strong base 
E) strong acid 
A) weak acid 
B) salt 
C) weak base 
D) strong base 
E) strong acid

Question 15

Assuming that the proposed aqueous reactants are mixed in stoichiometric ratios,and at moderate concentrations,which of the following is least likely to represent an observable (e.g. ,gas evolution or precipitation)reaction?

Accepted Answer

A) Ca2+ + 2 Cl- + 2 K+ + CO32- → ? 
B) 2 Na+ + CO32- + 2 HC2N3O2 → ? 
C) H2S + Cu2+ + SO42- → ? 
D) H2SO3 + Li+ + Cl- → ? 
E) Pb2+ + 2 NO3- + 2 Na+ + 2 OH- → ? 
A) Ca2+ + 2 Cl- + 2 K+ + CO32- → ? 
B) 2 Na+ + CO32- + 2 HC2N3O2 → ? 
C) H2S + Cu2+ + SO42- → ? 
D) H2SO3 + Li+ + Cl- → ? 
E) Pb2+ + 2 NO3- + 2 Na+ + 2 OH- → ?

Question 16

A piece of iron wire weighing 1.63 g is converted to Fe2+(aq)and requires 21.9 mL of KMnO4 solution for its titration.What is the molarity of the KMnO4 solution? The reaction occurring during the titration is:
5 Fe2+ (aq)+ MnO4- (aq)+ 8 H+ (aq)→ 5 Fe3+ (aq)+ Mn2+ (aq)+ 4 H2O

Accepted Answer

A) 1.33 M 
B) 0.267 M 
C) 2.67 × 10-4 M 
D) 14.9 M 
E) 1.33 × 10-3 M 
A) 1.33 M 
B) 0.267 M 
C) 2.67 × 10-4 M 
D) 14.9 M 
E) 1.33 × 10-3 M

Question 17

Which of the following would have the strongest tendency of producing OH- ions in an aqueous solution?

Accepted Answer

A) Fe(OH)2 
B) Fe(OH)3 
C) Ba(OH)2 
D) NaOH 
E) HOCl 
A) Fe(OH)2 
B) Fe(OH)3 
C) Ba(OH)2 
D) NaOH 
E) HOCl

Question 18

Trace amounts of oxygen gas can be "scrubbed" from gases using the following reaction:
4 Cr2+(aq)+ O2(g)+ 4 H+(aq)→ 4 Cr3+(aq)+ 2 H2O(l)
Which of the following statements is true regarding this reaction?

Accepted Answer

A) Oxygen gas is reduced to water. 
B) Cr2+(aq)is the oxidizing agent. 
C) O2(g)is the reducing agent. 
D) Electrons are transferred from O2 to Cr2+. 
A) Oxygen gas is reduced to water. 
B) Cr2+(aq)is the oxidizing agent. 
C) O2(g)is the reducing agent. 
D) Electrons are transferred from O2 to Cr2+.

Question 19

Which of the following compounds is an Arrhenius base?

Accepted Answer

A) CH3CO2H 
B) CH3CH2NH2 
C) HNO2 
D) H2SO4 
A) CH3CO2H 
B) CH3CH2NH2 
C) HNO2 
D) H2SO4

Question 20

Which of the following solutions has the highest fluoride concentration?

Accepted Answer

A) 0.05 M CaF2  
B) 2.1 mg/L NaF 
C) a solution having 1.5 mg/L F- 
D) a solution having 0.06 M F-  
E) 0.05 M NaF 
A) 0.05 M CaF2  
B) 2.1 mg/L NaF 
C) a solution having 1.5 mg/L F- 
D) a solution having 0.06 M F-  
E) 0.05 M NaF

Exam 5: Introduction to Reactions in Aqueous Solutions

Which of the following represents a disproportionation reaction?

In which of the following pairs is the oxidation number for the underlined element INCORRECT?

Which of the following represents a neutralization reaction?

Gold does not react with either nitric acid or hydrochloric acid but with a combination of both called aqua regia.Identify the oxidizing agent in the following equation: Au(s)+ 4 H+(aq)+ NO3-(aq)+ 4 Cl-(aq)→ [AuCl4]-(aq)+ 2 H2O(l)+ NO(g)

Which of the compounds H2C2O4,Ca(OH)2,KOH,and HI behave as bases when they are dissolved in water?

Identify the reducing agent in the following reaction: 2 NO2(g)+ 7 H2(g)→ 2 NH3(g)+ 4 H2O(g)

Which one of the following compounds is soluble in water?

When 280 mL of 1.50 × 10-4 mol L-1 hydrochloric acid is added to 105 mL of 1.75 × 10-4 mol L-1 Mg(OH)2,the resulting solution will be:

The mixing of which pair of reactants will result in a precipitation reaction?

Choose the INCORRECT statement.

Weak acids almost completely dissociate.

The mixing of which pair of reactants will result in a precipitation reaction?

The substance KOH is a:

Assuming that the proposed aqueous reactants are mixed in stoichiometric ratios,and at moderate concentrations,which of the following is least likely to represent an observable (e.g. ,gas evolution or precipitation)reaction?

A piece of iron wire weighing 1.63 g is converted to Fe2+(aq)and requires 21.9 mL of KMnO4 solution for its titration.What is the molarity of the KMnO4 solution? The reaction occurring during the titration is: 5 Fe2+ (aq)+ MnO4- (aq)+ 8 H+ (aq)→ 5 Fe3+ (aq)+ Mn2+ (aq)+ 4 H2O

Which of the following would have the strongest tendency of producing OH- ions in an aqueous solution?

Trace amounts of oxygen gas can be "scrubbed" from gases using the following reaction: 4 Cr2+(aq)+ O2(g)+ 4 H+(aq)→ 4 Cr3+(aq)+ 2 H2O(l) Which of the following statements is true regarding this reaction?

Which of the following compounds is an Arrhenius base?

Which of the following solutions has the highest fluoride concentration?

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

Gold does not react with either nitric acid or hydrochloric acid but with a combination of both called aqua regia.Identify the oxidizing agent in the following equation: Au(s)+ 4 H⁺(aq)+ NO₃^-(aq)+ 4 Cl^-(aq)→ [AuCl₄]^-(aq)+ 2 H₂O(l)+ NO(g)

Which of the compounds H₂C₂O₄,Ca(OH)₂,KOH,and HI behave as bases when they are dissolved in water?

Identify the reducing agent in the following reaction: 2 NO₂(g)+ 7 H₂(g)→ 2 NH₃(g)+ 4 H₂O(g)

When 280 mL of 1.50 × 10^-4mol L^-1 hydrochloric acid is added to 105 mL of 1.75 × 10^-4 mol L^-1 Mg(OH)₂,the resulting solution will be:

A piece of iron wire weighing 1.63 g is converted to Fe²⁺(aq)and requires 21.9 mL of KMnO₄ solution for its titration.What is the molarity of the KMnO₄ solution? The reaction occurring during the titration is: 5 Fe²⁺(aq)+ MnO₄^-(aq)+ 8 H⁺(aq)→ 5 Fe³⁺(aq)+ Mn²⁺(aq)+ 4 H₂O

Which of the following would have the strongest tendency of producing OH^- ions in an aqueous solution?

Trace amounts of oxygen gas can be "scrubbed" from gases using the following reaction: 4 Cr²⁺(aq)+ O₂(g)+ 4 H⁺(aq)→ 4 Cr³⁺(aq)+ 2 H₂O(l) Which of the following statements is true regarding this reaction?