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KEAM Electrochemistry — practice questions — page 4

Explore 111 free Electrochemistry questions in KEAM 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 91–111 of 111.

True or false: conductivity on dilutionRead the answer and worked solution →Strong electrolyte or weak electrolyte?Read the answer and worked solution →Kohlrausch's lawRead the answer and worked solution →Match each relation to what it linksRead the answer and worked solution →True or false: cells and electrodesRead the answer and worked solution →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

True or false: conductivity on dilution

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Questions
  1. Statement is true
    Yes
    Statement
    Conductivity decreases as concentration decreases.
  2. Statement is true
    Yes
    Statement
    Molar conductivity increases as concentration decreases.
  3. Statement is true
    No
    Statement
    Both conductivity and molar conductivity fall on dilution.
  4. Statement is true
    Yes
    Statement
    Molar conductivity is defined as κ divided by concentration.
  5. Statement is true
    Yes
    Statement
    Conductivity depends on the solvent and the temperature.
This is the counterintuitive one. Conductivity falls as you dilute because there are fewer ions per unit volume, while molar conductivity rises because each mole of electrolyte dissociates more completely. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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Strong electrolyte or weak electrolyte?

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Items
  1. Item
    Molar conductivity rises slowly on dilution
    Category
    Strong electrolyte
  2. Item
    Almost completely dissociated already
    Category
    Strong electrolyte
  3. Item
    Molar conductivity rises very steeply when dilute
    Category
    Weak electrolyte
  4. Item
    Dissociation increases sharply with dilution
    Category
    Weak electrolyte
Categories
  1. Item
    Strong electrolyte
  2. Item
    Weak electrolyte
Both show molar conductivity rising on dilution, but the shape differs: a slow rise for strong electrolytes, a very steep one for weak electrolytes in dilute solution. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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Kohlrausch's law

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Questions
  1. Question
    Kohlrausch's law applies at
    Choices
    1. infinite dilution
    2. high concentration
    3. the boiling point
    Correct choice
    infinite dilution
  2. Question
    It says molar conductivity is the sum of contributions from
    Choices
    1. the solvent molecules
    2. the ions the electrolyte dissociates into
    3. the electrodes
    Correct choice
    the ions the electrolyte dissociates into
  3. Question
    Its other name is the law of
    Choices
    1. mass action
    2. constant proportions
    3. independent migration of ions
    Correct choice
    independent migration of ions
  4. Question
    Molar conductivity Λm equals
    Choices
    1. κ ÷ c
    2. κ × c
    3. c ÷ κ
    Correct choice
    κ ÷ c
Molar conductivity at infinite dilution is the sum of the separate ionic contributions, which is why it is called the law of independent migration of ions. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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