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Question
Assertion :Molar conductivity increases with decrease in concentration. Reason: Conductivity always decreases with decrease in concentration.
Assertion :Molar conductivity increases with decrease in concentration. Reason: Conductivity always decreases with decrease in concentration.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Molar conductivity is defined as the conductivity of an electrolyte solution divided by the molar concentration of the electrolyte.
- Conductivity changes with the concentration of the electrolyte. The number of ions per unit volume carrying the current decreases on dilution, so conductivity always decreases with a decrease in concentration.
- However, molar conductivity increases with dilution. This is because the conductivity of a solution is the conductance of one unit volume of the solution, but molar conductivity is the conductance of that volume solution containing one mole of an electrolyte.
Hence Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
- Molar conductivity is defined as the conductivity of an electrolyte solution divided by the molar concentration of the electrolyte.
- Conductivity changes with the concentration of the electrolyte. The number of ions per unit volume carrying the current decreases on dilution, so conductivity always decreases with a decrease in concentration.
- However, molar conductivity increases with dilution. This is because the conductivity of a solution is the conductance of one unit volume of the solution, but molar conductivity is the conductance of that volume solution containing one mole of an electrolyte.
Hence Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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