Chemistry-12 MCQ
Q: “Crystalline solids are anisotropic in nature.” What is the meaning of anisotropic in the given statement?
a) A regular pattern of arrangement of particles which repeats itself periodically over the entire crystal.
b) Different values of some of physical properties are shown when measured along different directions in the same crystals.
c) An irregular arrangement of particles over the entire crystal.
d) Same values of some of physical properties are shown when measured along different directions in the same crystals.
Correct Answer: Different values of some of physical properties are shown when measured along different directions in the same crystals.
Class 12 Chemistry MCQs for CBSE, Bihar, UP Board
Explanation:
What is Anisotropic ?
Anisotropic refers to a characteristic of materials where certain physical properties vary depending on the direction in which they are measured. In the context of crystalline solids, this means that when you measure specific properties, such as hardness, electrical conductivity, or refractive index, in different directions within the same crystal, you will obtain different values.
Crystalline solids have a structured and orderly arrangement of particles, like atoms or molecules, that repeat in a regular pattern. This regularity can lead to variations in how the material interacts with external forces or fields based on the orientation of those forces relative to the crystal structure. For example, quartz crystals exhibit different hardness along different axes, and graphite conducts electricity well along one direction but poorly in others.
Option B accurately describes this behavior by stating that different values of some physical properties are observed when measured along different directions in the same crystal. This directional dependence of properties is what makes a crystalline solid anisotropic.