Electro Chemistry Additional Practice Test

12th Standard Chemistry — Electro Chemistry: Additional Online Practice Test

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According to Ohm's law, at a constant temperature, the current (\(I\)) flowing through a conductivity cell is directly proportional to the applied voltage (\(V\)) and inversely proportional to which factor?

A.Conductance B.Concentration C.Resistance D.Temperature

The specific resistance or resistivity (\(\rho\)) of an electrolytic solution is an intensive property that depends primarily on which of the following?

A.Surface area of the electrodes B.Distance between the electrodes C.Nature of the electrolyte D.Total volume of the solution

Why is an alternating current (AC) source used instead of a direct current (DC) source when measuring the conductivity of an ionic solution using a Wheatstone bridge?

A.To increase the measured resistance B.To prevent the electrolysis of the solution C.To simplify the circuit diagram D.To reduce the required voltage

Which type of electrochemical device utilizes an electric current from an external source to drive a non-spontaneous chemical reaction?

A.Galvanic cell B.Voltaic cell C.Electrolytic cell D.Fuel cell

In the standard Daniel cell, which metal serves as the anode where oxidation occurs during discharge?

A.Copper B.Platinum C.Zinc D.Silver

What is the primary function of the salt bridge in a galvanic cell like the Daniel cell?

A.To provide a path for electron flow B.To maintain electrical neutrality in both half-cells C.To act as a catalyst for the redox reaction D.To separate the liquid and solid phases

According to IUPAC galvanic cell notation, where is the cathode half-cell traditionally positioned relative to the salt bridge?

A.On the left side B.On the right side C.Between two phase boundaries D.On the extreme left

The electromotive force (emf) is the potential difference between two electrodes. What is the SI unit for cell potential?

A.Coulomb B.Joule C.Volt D.Ampere

What is the arbitrarily assigned electrode potential value for the Standard Hydrogen Electrode (SHE) at all temperatures?

A.1.00 V B.0.00 V C.0.76 V D.-0.34 V

Q10

The maximum electrical work (\(W_{max}\)) that can be obtained from a galvanic cell is equal to which thermodynamic quantity?

A.Increase in Entropy B.Decrease in Internal Energy C.Decrease in Gibbs free energy (\(\Delta G\)) D.Increase in Enthalpy

Q11

Using the Nernst equation, what is the effect on the cell potential (\(E_{cell}\)) if the concentration of the products in a redox reaction is increased tenfold?

A.The cell potential increases B.The cell potential decreases C.The cell potential remains unchanged D.The cell potential drops to zero

Q12

During the electrolysis of molten sodium chloride, which substance is produced at the graphite anode?

A.Metallic sodium B.Chlorine gas C.Hydrogen gas D.Oxygen gas

Q13

Which of the following defines the electrochemical equivalent (\(Z\)) as per Faraday's First Law of Electrolysis?

A.Mass produced by 1 mole of electrons B.Mass produced by 1 coulomb of charge C.Charge required to deposit 1 gram of substance D.Ratio of molar mass to valence

Q14

Which of the following is categorized as a secondary battery because its electrochemical reactions are reversible?

A.Leclanche cell B.Mercury button cell C.Lead storage battery D.Dry cell battery

Q15

In the electrochemical series, a metal with a highly negative standard reduction potential (\(E^{\circ}\)) will likely serve as a powerful what?

A.Oxidizing agent B.Reducing agent C.Inert electrode D.Catalyst

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About this Electro Chemistry test

This free online practice test covers Electro Chemistry from the 12th Standard Chemistry (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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