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Electrochemistry

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Electrochemical Cells

Subtopic

Electrochemical Cells under Electrochemistry for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the function of the voltmeter in an electrochemical cell experiment?

    A.

    To provide power

    B.

    To measure the potential difference

    C.

    To complete the internal circuit

    D.

    To increase the reaction rate

  2. 2.

    In a Daniell cell, what is the value of the standard cell potential (Ecell∘E^{\circ}_{cell})?

    A.

    1.1 V

    B.

    2.1 V

    C.

    0.5 V

    D.

    1.5 V

  3. 3.

    A Galvanic cell is also commonly known as a:

    A.

    Voltaic cell

    B.

    Electrolytic cell

    C.

    Faraday cell

    D.

    Conductivity cell

Download the worksheet for Electrochemistry - Electrochemical Cells to practice offline. It includes additional chapter-level practice questions.

Galvanic Cells and Nernst Equation

Subtopic

Galvanic Cells and Nernst Equation under Electrochemistry for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In a Cuβˆ’AgCu-Ag Galvanic cell (ECu2+/Cuo=0.34V,EAg+/Ago=0.80VE^o_{Cu^{2+}/Cu} = 0.34V, E^o_{Ag^+/Ag} = 0.80V), which metal acts as the cathode?

    A.

    Copper

    B.

    Silver

    C.

    Both

    D.

    Neither

  2. 2.

    Which physical quantity is measured by the product of nn, FF, and EcellE_{cell}?

    A.

    Power

    B.

    Total Charge

    C.

    Electrical Work

    D.

    Resistance

  3. 3.

    What is the sign of the cathode in an electrolytic cell (not a Galvanic cell), to distinguish it from the topic at hand?

    A.

    Positive

    B.

    Negative

    C.

    Neutral

    D.

    It has no sign

Download the worksheet for Electrochemistry - Galvanic Cells and Nernst Equation to practice offline. It includes additional chapter-level practice questions.

Conductance of Electrolytic Solutions

Subtopic

Conductance of Electrolytic Solutions under Electrochemistry for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The molar conductivity of CH3COONaCH_3COONa, HClHCl, and NaClNaCl at infinite dilution are x,y,x, y, and zz respectively. What is Ξ›m∘\Lambda_m^\circ for CH3COOHCH_3COOH?

    A.

    x+y+zx + y + z

    B.

    x+yβˆ’zx + y - z

    C.

    xβˆ’y+zx - y + z

    D.

    y+zβˆ’xy + z - x

  2. 2.

    Kohlrausch's law can be used to calculate which property of a weak acid?

    A.

    Limiting molar conductivity

    B.

    Mass of the acid

    C.

    Color of the solution

    D.

    Atmospheric pressure

  3. 3.

    The molar conductivity of a weak electrolyte is low at high concentration because:

    A.

    The electrolyte is fully dissociated

    B.

    The degree of dissociation is low

    C.

    The ions move very fast

    D.

    The solvent evaporates

Download the worksheet for Electrochemistry - Conductance of Electrolytic Solutions to practice offline. It includes additional chapter-level practice questions.

Electrolytic Cells and Electrolysis

Subtopic

Electrolytic Cells and Electrolysis under Electrochemistry for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following is the correct unit for current in the context of Faraday's equations?

    A.

    Volt (VV)

    B.

    Ampere (AA)

    C.

    Ohm (Ξ©\Omega)

    D.

    Watt (WW)

  2. 2.

    The number of electrons involved in the reduction of 11 mole of MnO4βˆ’MnO_4^- to Mn2+Mn^{2+} is:

    A.

    11

    B.

    22

    C.

    55

    D.

    77

  3. 3.

    During the electrolysis of molten CaCl2CaCl_2, what is produced at the anode?

    A.

    Calcium metal

    B.

    Chlorine gas

    C.

    Oxygen gas

    D.

    Hydrogen gas

Download the worksheet for Electrochemistry - Electrolytic Cells and Electrolysis to practice offline. It includes additional chapter-level practice questions.

Batteries and Fuel Cells

Subtopic

Batteries and Fuel Cells under Electrochemistry for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the function of the carbon black mixed with MnO2MnO_2 in a dry cell?

    A.

    To increase the conductivity of the electrode

    B.

    To act as the anode

    C.

    To absorb water

    D.

    To prevent the electrolyte from leaking

  2. 2.

    Which of the following statements about fuel cells is FALSE?

    A.

    They are a type of galvanic cell

    B.

    They can run indefinitely as long as reactants are supplied

    C.

    They have low efficiency compared to steam turbines

    D.

    They are used in space vehicles

  3. 3.

    The carbon rod in a LeclanchΓ© cell is surrounded by a mixture of:

    A.

    ZnCl2ZnCl_2 and NH4ClNH_4Cl

    B.

    MnO2MnO_2 and carbon black

    C.

    PbO2PbO_2 and PbPb

    D.

    KOHKOH and ZnOZnO

Download the worksheet for Electrochemistry - Batteries and Fuel Cells to practice offline. It includes additional chapter-level practice questions.

Corrosion

Subtopic

Corrosion under Electrochemistry for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Corrosion is a spontaneous process. This means that for the corrosion reaction:

    A.

    Ξ”G\Delta G is positive

    B.

    Ξ”G\Delta G is negative

    C.

    Ξ”G\Delta G is zero

    D.

    EcellE_{cell} is negative

  2. 2.

    Boiled distilled water covered with a layer of oil prevents rusting because:

    A.

    Oil reacts with iron to form a protector

    B.

    Boiling removes dissolved oxygen and oil prevents its re-entry

    C.

    Distilled water is too acidic

    D.

    The oil acts as a catalyst

  3. 3.

    What happens to the electrons released by iron atoms at the anodic site during rusting?

    A.

    They are lost to the atmosphere

    B.

    They flow through the metal to the cathodic site

    C.

    They are absorbed by the iron nucleus

    D.

    They convert Fe2+Fe^{2+} back to FeFe

Download the worksheet for Electrochemistry - Corrosion to practice offline. It includes additional chapter-level practice questions.