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COMEDK Electrochemistry — practice questions — page 3

Explore 76 free Electrochemistry questions in COMEDK Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Electrochemistry questions and exercises with answers

Showing questions 61–76 of 76.

Tap every statement true of a galvanic cellRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Complete the thermodynamic linksRead the answer and worked solution →What the Nernst equation is forRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →True or false: batteries, fuel cells and corrosionRead the answer and worked solution →Order the steps: find a standard cell potentialRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Tap every factor conductivity depends onRead the answer and worked solution →Assertion and reason: potentialsRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Complete the dilution behaviourRead the answer and worked solution →True or false: the standard scaleRead the answer and worked solution →

Worked practice questions

Tap every statement true of a galvanic cell

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Questions
  1. Items
    1. Text
      Its redox reaction is spontaneous
      Matches the category
      Yes
    2. Text
      It produces electrical work
      Matches the category
      Yes
    3. Text
      A fuel cell is one
      Matches the category
      Yes
    4. Text
      It needs an external power supply
      Matches the category
      No
    5. Text
      It drives a non-spontaneous reaction
      Matches the category
      No
    Category
    True of a GALVANIC cell
  2. Items
    1. Text
      Defined as κ ÷ c
      Matches the category
      Yes
    2. Text
      Increases as concentration falls
      Matches the category
      Yes
    3. Text
      Decreases as concentration falls
      Matches the category
      No
    4. Text
      Is the same as conductivity
      Matches the category
      No
    Category
    True of MOLAR conductivity
Batteries and fuel cells are both galvanic. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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Assertion and reason

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Questions
  1. Reason
    Dilution lowers the ions per unit volume but raises dissociation per mole.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Conductivity falls on dilution while molar conductivity rises.
  2. Reason
    Only differences in electrode potential can be measured, so a reference is chosen.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    The standard hydrogen electrode is assigned zero potential.
  3. Reason
    An electrolytic cell drives a non-spontaneous reaction.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    An electrolytic cell produces electrical energy.
  4. Reason
    It involves oxidation and reduction at different sites on the metal.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Corrosion is an electrochemical phenomenon.
The reason must genuinely explain the assertion. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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Two are true, one is not

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Questions
  1. False statement
    A galvanic cell needs an external power supply
    Statements
    1. A galvanic cell runs a spontaneous reaction
    2. An electrolytic cell consumes electrical energy
    3. A galvanic cell needs an external power supply
  2. False statement
    Molar conductivity decreases with dilution
    Statements
    1. Molar conductivity decreases with dilution
    2. Conductivity decreases with dilution
    3. Molar conductivity increases with dilution
  3. False statement
    Electrode potentials are absolute, not relative
    Statements
    1. E°(cell) = E°(cathode) − E°(anode)
    2. Electrode potentials are absolute, not relative
    3. The hydrogen electrode is the zero of the scale
The false line always swaps galvanic for electrolytic, or conductivity for molar conductivity. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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