Karnataka PUC II Electrochemistry — practice questions — page 4

Explore 95 free Electrochemistry questions in Karnataka PUC II 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 91–95 of 95.

Three of these are wrong. Find the one that holds.Read the answer and worked solution →Galvanic cell or electrolytic cell?Read the answer and worked solution →The potential developed between a metal rod and its solution due to oxidation is called:Read the answer and worked solution →The standard reduction potential of the standard hydrogen electrode (SHE) is assigned the value:Read the answer and worked solution →In a GALVANIC cell, the ANODE is:Read the answer and worked solution →

Worked practice questions

Three of these are wrong. Find the one that holds.

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Questions

Question
Three of these statements about molar conductivity are false.
Choices
1. Item
  It equals κ divided by concentration
  Correct
  Yes
2. Explanation
  Molar conductivity RISES on dilution.
  Item
  It falls as the solution is diluted
3. Explanation
  Conductivity is per unit volume, not per mole.
  Item
  It is the same as conductivity
4. Explanation
  The concentration divides, it does not multiply.
  Item
  It equals κ times concentration
Question
Three of these statements about cells are false.
Choices
1. Item
  Galvanic cells run spontaneous redox
  Correct
  Yes
2. Explanation
  It consumes electrical energy instead.
  Item
  An electrolytic cell produces energy
3. Explanation
  It is the source, not the load.
  Item
  A galvanic cell needs a power supply
4. Explanation
  Only the electrolytic cell does.
  Item
  Both types drive non-spontaneous redox

Each trap is a real misreading of the chapter. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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Galvanic cell or electrolytic cell?

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Items

Item
Runs a spontaneous redox reaction
Category
Galvanic cell
Item
Produces electrical work
Category
Galvanic cell
Item
A battery in use
Category
Galvanic cell
Item
Drives a non-spontaneous reaction
Category
Electrolytic cell
Item
Consumes electrical energy
Category
Electrolytic cell
Item
Electroplating a spoon
Category
Electrolytic cell

Categories

Item
Galvanic cell
Item
Electrolytic cell

A galvanic cell turns the chemical energy of a SPONTANEOUS redox reaction into electrical work. An electrolytic cell spends electrical energy to drive a NON-spontaneous one. Everything else follows from that. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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The potential developed between a metal rod and its solution due to oxidation is called:

Reduction potential
Oxidation potential
Solubility potential
Neutralization potential

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Correct answer: B. Oxidation potential

The notes define the potential developed between the rod and the solution in this case as oxidation potential, represented by $E(Zn/Zn^{2+})$.

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