- Exam
- JEE Main
- Year
- 2022
- Date
- 27 July
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- Electrochemistry
JEE Main 2022 · 27 July · Evening Shift · Chemistry · Electrochemistry
Given below are two statements: Statement I: For KI , molar...
Given below are two statements:
Statement I: For , molar conductivity increases steeply with dilution.
Statement II: For carbonic acid, molar conductivity increases slowly with dilution. In the light of the above statements, choose the correct answer from the options given below
Options
- AStatement I is correct and Statement II is incorrect
- BBoth Statement I and Statement II are false
- CStatement I is true but Statement II is false
- DStatement I is false but Statement II is true
Correct answer
B. Both Statement I and Statement II are false
Step-by-step solution
For strong electrolytes, {∧}_{m} increases slowly with dilution and can be represented by the equation:
{∧}_{m} = {∧}_{m}^{o} - Ac\dfrac{1}{2}
It can be seen that if we plot {∧}_{m} against , We obtain a straight line with intercept equal to {∧}_{m} and slope equal to ''. The value of the constant '' for a given solvent and temperature depends on the type of electrolyte. is a strong electrolyte.
Weak electrolytes like carbonic acid and have lower degree of dissociation at higher concentrations and hence for such electrolytes, the change in {∧}_{m} with dilution is due to increase in the degree of dissociation and consequently the number of ions in total volume of solution that contains of electrolyte. In such cases {∧}_{m} increases steeply on dilution, especially near lower concentrations. Therefore, {∧}_{m}^{o} cannot be obtained by extrapolation of {∧}_{m} to zero concentration.