Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The angle between any two faces of a crystal is termed as interfacial angle. Reason (R) : The interfacial angles of corresponding faces of different crystals are constant if they have same chemical composition and measurements are taken at same temperature. In the light of the above statements, choose the most appropriate answer from the options given below :
Crystal Interfacial Angles: Assertion (A) and Reason (R) Analysis
This question asks us to evaluate two statements related to crystallography, specifically concerning interfacial angles.
Assertion (A) Analysis: Defining Interfacial Angle
Assertion (A) states: "The angle between any two faces of a crystal is termed as interfacial angle."
This statement is a standard and correct definition in crystallography. The interfacial angle is precisely the angle formed between the plane surfaces of two adjacent crystal faces.
Conclusion for (A): Assertion (A) is correct.
Reason (R) Analysis: Constancy of Interfacial Angles
Reason (R) states: "The interfacial angles of corresponding faces of different crystals are constant if they have same chemical composition and measurements are taken at same temperature."
This statement accurately reflects the Law of Constancy of Interfacial Angles, also known as Steno's Law. This is a fundamental principle in crystallography.
The law indicates that for a given crystalline substance, the angles between its corresponding crystal faces remain the same, irrespective of the crystal's size or shape, provided measurements are made under uniform conditions (same temperature and pressure) and the chemical composition is identical.
Conclusion for (R): Reason (R) is correct.
Relationship Between Assertion (A) and Reason (R)
Both Assertion (A) and Reason (R) are true statements about interfacial angles. However, they do not have a direct cause-and-effect relationship where (R) explains (A):
- Assertion (A) provides the definition of what an interfacial angle is.
- Reason (R) describes a significant property (constancy) of these angles, which arises from the crystal's internal structure.
Reason (R) explains a characteristic behavior of interfacial angles but does not explain why they are defined as such. Therefore, (R) is not the correct explanation for (A).
Final Choice
Since both statements are correct but Reason (R) does not explain Assertion (A), the most appropriate option is that both are correct, but (R) is not the correct explanation of (A).
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Important Questions from Mixed Topic (CUET PG)
- Kalpsutra, the illustrated canonical text is from:-
- The Harappan city almost exclusively devoted to craft production was-:
- Mohandas Karamchand Gandhi launched quit India movement after the failure of:-
- The "Objectives Resolution" was introduced in constituent assembly by:-
- Who among the following was not a member of the constituent assembly:-
