In the following question two statements (Assertion) A and...

In the following question two statements (Assertion) A and Reason (R) are given. Mark a. if $\mathrm{A}$ and $\mathrm{R}$ both are correct and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$; b. if $A$ and $R$ both are correct but $R$ is not the correct explanation of A; c. $\mathrm{A}$ is true but $\mathrm{R}$ is false; d. A is false but $\mathrm{R}$ is true, e. A and $R$ both are false. (A): The mobility of sodium ion is lower than that of potassium ion. $(\mathbf{R}):$ The ionic mobilities depend upon the effective radius of the ion.

In the following question two statements (Assertion) A and Reason (R) are given. Mark
a. if $\mathrm{A}$ and $\mathrm{R}$ both are correct and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$;
b. if $A$ and $R$ both are correct but $R$ is not the correct explanation of A;
c. $\mathrm{A}$ is true but $\mathrm{R}$ is false;
d. A is false but $\mathrm{R}$ is true,
e. A and $R$ both are false.
(A): The mobility of sodium ion is lower than that of potassium ion.
$(\mathbf{R}):$ The ionic mobilities depend upon the effective radius of the ion.

Key Concepts

Ionic Mobility

Ionic mobility refers to the speed at which an ion moves through a medium under the influence of an electric field. It is an essential concept in understanding the conductivity of electrolytic solutions and how different ions behave based on factors such as size, charge, and solvation effects.

Effective Ionic Radius

The effective ionic radius is a measure of the size of an ion, which can take into account the ion’s interaction with its surrounding environment, including its solvation shell in aqueous solutions. This concept is crucial in predicting various physical properties, such as ionic bonding and mobility, where the accessible size of the ion influences its dynamics.

Relationship between Ionic Mobility and Ionic Size

Ionic mobility is closely related to the effective ionic radius since smaller or less hindered ions generally move faster in an electric field. However, this relationship can be complex because factors like solvation and ion-specific interactions also affect how easily an ion can move in a given medium. Understanding this interplay helps explain why similar ions might exhibit different mobilities despite having comparable charges.

Assertion-Reason Questions

Assertion-reason questions are a common format in scientific examinations where a statement (assertion) and its provided explanation (reason) must be evaluated for their veracity and logical connection. This format not only tests a student's knowledge of factual content but also their ability to reason through why a particular concept holds true, enabling a deeper understanding of the subject matter.

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