Q. In electrochemical cells, what does the salt bridge do?
A.
Facilitates electron flow
B.
Maintains charge balance
C.
Increases reaction rate
D.
Prevents gas buildup
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Solution
The salt bridge maintains charge balance by allowing ions to flow between the two half-cells, preventing charge buildup.
Correct Answer:
B
— Maintains charge balance
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Q. In electrochemical sensors, what is typically measured?
A.
Current
B.
Voltage
C.
Resistance
D.
Temperature
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Solution
Electrochemical sensors measure current as a response to the concentration of analytes, which is related to the electrochemical reaction occurring.
Correct Answer:
A
— Current
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Q. In fuel cells, what is the role of the anode?
A.
Oxidation of fuel
B.
Reduction of oxygen
C.
Storage of energy
D.
Heat generation
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Solution
The anode is where the oxidation of the fuel occurs, releasing electrons that flow through an external circuit.
Correct Answer:
A
— Oxidation of fuel
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Q. What is the main advantage of using electrochemical methods for wastewater treatment?
A.
High efficiency
B.
Low cost
C.
Simplicity
D.
No chemical residues
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Solution
Electrochemical methods can effectively treat wastewater without adding chemical residues, making it an environmentally friendly option.
Correct Answer:
D
— No chemical residues
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Q. What is the main advantage of using supercapacitors over traditional batteries?
A.
Higher energy density
B.
Faster charge and discharge rates
C.
Lower cost
D.
Longer lifespan
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Solution
Supercapacitors can charge and discharge much faster than traditional batteries, making them suitable for applications requiring rapid energy delivery.
Correct Answer:
B
— Faster charge and discharge rates
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Q. What is the Nernst equation used for in electrochemistry?
A.
Calculating cell potential
B.
Determining reaction rate
C.
Measuring pH
D.
Assessing temperature changes
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Solution
The Nernst equation relates the cell potential to the concentrations of reactants and products, allowing for the calculation of cell voltage under non-standard conditions.
Correct Answer:
A
— Calculating cell potential
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Q. What is the primary application of electrochemistry in batteries?
A.
Energy storage
B.
Water purification
C.
Food preservation
D.
Air filtration
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Solution
Batteries store energy through electrochemical reactions, allowing for the conversion of chemical energy into electrical energy.
Correct Answer:
A
— Energy storage
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Q. What is the primary function of a galvanic cell?
A.
Convert chemical energy to electrical energy
B.
Store electrical energy
C.
Generate heat
D.
Facilitate chemical reactions
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Solution
A galvanic cell converts chemical energy from spontaneous redox reactions into electrical energy.
Correct Answer:
A
— Convert chemical energy to electrical energy
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Q. What is the primary purpose of a salt bridge in an electrochemical cell?
A.
Maintain charge balance
B.
Increase reaction rate
C.
Enhance conductivity
D.
Store energy
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Solution
A salt bridge maintains charge balance by allowing ions to flow between the two half-cells, preventing charge buildup.
Correct Answer:
A
— Maintain charge balance
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Q. What is the primary use of electrochemical sensors?
A.
Detecting pollutants
B.
Measuring temperature
C.
Analyzing pressure
D.
Monitoring humidity
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Solution
Electrochemical sensors are widely used to detect and quantify pollutants in various environments.
Correct Answer:
A
— Detecting pollutants
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Q. Which application of electrochemistry is used for corrosion prevention?
A.
Anodic protection
B.
Cathodic protection
C.
Electrolysis
D.
Electroplating
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Solution
Cathodic protection prevents corrosion by making the metal surface the cathode in an electrochemical cell.
Correct Answer:
B
— Cathodic protection
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Q. Which electrochemical process is essential for the operation of a galvanic cell?
A.
Spontaneous redox reaction
B.
Electrolysis
C.
Thermal decomposition
D.
Photovoltaic effect
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Solution
A galvanic cell operates based on spontaneous redox reactions that generate electrical energy from chemical energy.
Correct Answer:
A
— Spontaneous redox reaction
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Q. Which electrochemical process is used in electroplating?
A.
Reduction
B.
Oxidation
C.
Sublimation
D.
Condensation
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Solution
Electroplating involves the reduction of metal cations from a solution to deposit a layer of metal onto a surface.
Correct Answer:
A
— Reduction
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Q. Which electrochemical technique is commonly used for the detection of glucose in blood?
A.
Potentiometry
B.
Voltammetry
C.
Conductometry
D.
Spectrophotometry
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Solution
Voltammetry is often used in glucose sensors, where the current is measured as a function of applied voltage to determine glucose concentration.
Correct Answer:
B
— Voltammetry
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Q. Which of the following is a common application of electrochemistry in corrosion prevention?
A.
Cathodic protection
B.
Anodic oxidation
C.
Thermal treatment
D.
Mechanical reinforcement
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Solution
Cathodic protection is a technique that prevents corrosion by making the metal surface the cathode of an electrochemical cell.
Correct Answer:
A
— Cathodic protection
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