Question:

Which of the following is NOT true about the amorphous solids ?

Updated On: Apr 6, 2025

Amorphous solids can be moulded by heating.
On heating they may become crystalline on certain temperature.
They are anisotropic in nature
They may become crystalline on keeping for long time.

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The Correct Option is C

Approach Solution - 1

The statement that is NOT true about amorphous solids is: (C) They are anisotropic in nature.
Amorphous solids do not have a well-defined long-range order like crystalline solids. They have a disordered arrangement of atoms or molecules, resulting in a lack of symmetry in their structure. Due to this lack of long-range order, amorphous solids exhibit isotropic properties, meaning their properties are the same in all directions. In contrast, crystalline solids have a well-defined periodic arrangement and can exhibit anisotropic properties, meaning their properties can vary depending on the direction.
Therefore, amorphous solids are NOT anisotropic in nature.

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Approach Solution -2

Which of the following is NOT true about the amorphous solids

Amorphous solids can be moulded by heating – ✅ True
On heating they may become crystalline at certain temperature – ✅ True
They are anisotropic in nature – ❌ False
They may become crystalline on keeping for long time – ✅ True

Explanation:

Amorphous solids are isotropic in nature, meaning their physical properties are the same in all directions because they lack a regular and long-range arrangement of particles. Hence, the statement "They are anisotropic in nature" is not true.

Correct Answer: They are anisotropic in nature

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Concepts Used:

Solid State

Solids are substances that are featured by a definite shape, volume, and high density. In the solid-state, the composed particles are arranged in several manners. Solid-state, in simple terms, means "no moving parts." Thus solid-state electronic devices are the ones inclusive of solid components that don’t change their position. Solid is a state of matter where the composed particles are arranged close to each other. The composed particles can be either atoms, molecules, or ions.

Types of Solids:

Based on the nature of the order that is present in the arrangement of their constituent particles solids can be divided into two types;

Amorphous solids behave the same as super cool liquids due to the arrangement of constituent particles in short-range order. They are isotropic and have a broad melting point (range is about greater than 5°C).
Crystalline solids have a fixed shape and the constituent particles are arranged in a long-range order.