Q. In a concentration cell, the electrodes are made of: (2020)
A.
Different metals
B.
Same metal but different concentrations
C.
Same metal and same concentration
D.
Different electrolytes
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Solution
In a concentration cell, the electrodes are made of the same metal but have different concentrations of the electrolyte.
Correct Answer: B — Same metal but different concentrations
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Q. In a concentration cell, the two half-cells have: (2019)
A.
Different electrodes
B.
Same electrodes but different concentrations
C.
Same concentrations
D.
Different temperatures
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Solution
In a concentration cell, the two half-cells have the same electrodes but different concentrations of the electrolyte.
Correct Answer: B — Same electrodes but different concentrations
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Q. In an electrochemical cell, the anode is where: (2019)
A.
Oxidation occurs
B.
Reduction occurs
C.
Electrons are gained
D.
Ions are produced
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Solution
In an electrochemical cell, oxidation occurs at the anode.
Correct Answer: A — Oxidation occurs
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Q. In electrolysis, the process of oxidation occurs at which electrode? (2019)
A.
Anode
B.
Cathode
C.
Both electrodes
D.
None of the above
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Solution
In electrolysis, oxidation occurs at the anode.
Correct Answer: A — Anode
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Q. The electrochemical series is a list of elements arranged according to their: (2022)
A.
Atomic mass
B.
Electronegativity
C.
Standard electrode potentials
D.
Ionization energy
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Solution
The electrochemical series arranges elements based on their standard electrode potentials.
Correct Answer: C — Standard electrode potentials
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Q. The electrochemical series is a list of: (2023)
A.
Reactions
B.
Electrodes arranged by standard electrode potential
C.
Ionic compounds
D.
Gases
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Solution
The electrochemical series is a list of electrodes arranged by their standard electrode potentials, indicating their tendency to gain or lose electrons.
Correct Answer: B — Electrodes arranged by standard electrode potential
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Q. The Faraday's first law of electrolysis states that: (2018)
A.
The mass of substance deposited is directly proportional to the current
B.
The voltage is directly proportional to the current
C.
The energy is conserved
D.
The temperature remains constant
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Solution
Faraday's first law states that the mass of a substance deposited at an electrode is directly proportional to the quantity of electricity passed through the electrolyte.
Correct Answer: A — The mass of substance deposited is directly proportional to the current
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Q. What is the effect of increasing temperature on the conductivity of an electrolyte solution? (2019)
A.
Increases conductivity
B.
Decreases conductivity
C.
No effect
D.
Depends on the electrolyte
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Solution
Increasing temperature generally increases the conductivity of an electrolyte solution due to increased ion mobility.
Correct Answer: A — Increases conductivity
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Q. Which of the following ions is a common spectator ion in electrochemical reactions? (2020)
A.
Na+
B.
Cl-
C.
Ag+
D.
Cu2+
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Solution
Sodium ion (Na+) is often a spectator ion in many electrochemical reactions.
Correct Answer: A — Na+
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Q. Which of the following ions is commonly used as a reference electrode? (2020)
A.
Ag+
B.
Cl-
C.
K+
D.
Hg2+
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Solution
Silver ions (Ag+) are commonly used in reference electrodes, particularly in silver/silver chloride electrodes.
Correct Answer: A — Ag+
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Q. Which of the following ions is commonly used in a salt bridge? (2020)
A.
Na+
B.
Cl-
C.
K+
D.
Ca2+
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Solution
Potassium ions (K+) are commonly used in salt bridges to maintain electrical neutrality.
Correct Answer: C — K+
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Q. Which of the following is a characteristic of a reversible cell? (2019)
A.
It can be recharged
B.
It cannot be recharged
C.
It has a fixed voltage
D.
It operates at constant temperature
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Solution
A reversible cell can be recharged, allowing it to be used multiple times.
Correct Answer: A — It can be recharged
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Q. Which of the following metals has the highest standard reduction potential? (2019)
A.
Gold
B.
Silver
C.
Copper
D.
Zinc
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Solution
Gold has the highest standard reduction potential among the given metals.
Correct Answer: A — Gold
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Q. Which of the following statements is true about a galvanic cell? (2020)
A.
It converts chemical energy to electrical energy
B.
It requires an external power source
C.
It is always non-spontaneous
D.
It operates at constant temperature only
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Solution
A galvanic cell converts chemical energy into electrical energy spontaneously.
Correct Answer: A — It converts chemical energy to electrical energy
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Q. Which of the following statements is true for a galvanic cell? (2020)
A.
It converts chemical energy to electrical energy
B.
It requires an external power source
C.
It is always non-spontaneous
D.
It operates at constant temperature only
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Solution
A galvanic cell converts chemical energy into electrical energy spontaneously.
Correct Answer: A — It converts chemical energy to electrical energy
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