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JEE Main Electrochemistry — practice questions — page 4

Explore 114 free Electrochemistry questions in JEE Main 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 91–114 of 114.

Assertion and reasonRead the answer and worked solution →Two are true, one is notRead 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 →True or false: the standard scaleRead the answer and worked solution →Galvanic or electrolytic cell?Read the answer and worked solution →True or false: electrochemistryRead the answer and worked solution →Match each electrode to the potential your syllabus givesRead the answer and worked solution →Assertion and reason: potentialsRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Kohlrausch's lawRead the answer and worked solution →Which half-reaction from the notes represents reduction?Read the answer and worked solution →The Nernst equation at 25°C for a cell reaction is:Read the answer and worked solution →Tap every factor conductivity depends onRead the answer and worked solution →In a Daniell cell, $\mathrm{Zn} | \mathrm{Zn}^{2+}(aq) \,||\, \mathrm{Cu}^{2+}(aq) | \mathrm{Cu}$, the standard EMF is calculated as:Read the answer and worked solution →Order the steps: find a standard cell potentialRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Complete the dilution behaviourRead the answer and worked solution →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

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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Which quantity is being described?

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Items
  1. Item
    Falls as the solution is diluted
    Category
    Conductivity κ
  2. Item
    Depends on solvent and temperature
    Category
    Conductivity κ
  3. Item
    Equals κ ÷ c
    Category
    Molar conductivity Λm
  4. Item
    Rises as the solution is diluted
    Category
    Molar conductivity Λm
  5. Item
    Measured against the hydrogen electrode
    Category
    Electrode potential
  6. Item
    Quoted in volts
    Category
    Electrode potential
Categories
  1. Item
    Conductivity κ
  2. Item
    Molar conductivity Λm
  3. Item
    Electrode potential
Conductivity, molar conductivity and electrode potential are constantly swapped. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.

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