Which feature is common to all solids?

Correct option is D

The correct answer is (d) Definite volume and shape under normal conditions

Explanation:
• Solids represent a fundamental state of matter that is uniquely characterized by profound structural rigidity and an innate resistance to changes in shape or volume.
• At the microscopic level, the constituent particles (atoms, molecules, or ions) are very closely packed and firmly held together by strong intermolecular forces.
• Because these particles are locked into fixed positions and can only vibrate, solids inherently maintain a definite shape and a rigorously definite volume.
• Unlike gases, solids categorically do not expand dynamically to completely fill whatever container they are placed in.
• Unlike liquids, they do not loosely take the shape of the container they currently occupy.

Information Booster:
• Due to their tightly packed particle arrangement, solids uniformly possess negligible compressibility compared to the highly compressible gaseous state.
• Furthermore, solids generally exhibit a demonstrably higher density compared to their corresponding liquid and gaseous forms (with rare structural exceptions like frozen ice).

Additional Knowledge:
Infinite expansion capability with added energy (Option a)
• This descriptive feature represents a defining property of gases, not of solid materials.

Easily compressible structure when pressure applied (Option b)
• High compressibility is exclusively a characteristic of gases; standard solids are considered to be almost entirely incompressible.

Ability to flow like liquids in open containers (Option c)
• The ability to flow is a defining dynamic property of fluids (which strictly includes liquids and gases); typical solids completely lack the ability to flow.

So the correct answer is (d)