Crystalline solids are characterised by:
AA short-range ordered arrangement of particles
BA long-range, regularly repeating arrangement of particles
CNo definite shape
DThe absence of definite melting point
Answer & Solution
Correct answer: B. A long-range, regularly repeating arrangement of particles
Crystalline solids have a long-range, periodic arrangement of constituent particles. NaCl, diamond, ice, metals at usual conditions are crystalline.
Amorphous solids (glass, rubber) lack long-range order. They show only short-range order (option A), no definite melting point, and fracture along irregular surfaces.
Crystallinity is what gives sharp X-ray diffraction patterns and well-defined melting points.
Related questions
Ionic solids must always maintain:Vacancy and interstitial defects are shown by solids that are:An interstitial defect changes the density of a substance by:Particles occupying an interstitial site give a defect that is:A cell with extra particles on two opposite faces is:A cell with an extra particle at the centre of every face is:A cell with one extra particle at its centre is called:Centred unit cells come in how many types?