NEET · Chemistry · The Solid State doubts
9 doubts found
Diamond and graphite are both pure carbon — why is one the hardest natural material and the other soft enough to write with?
It's the bonding arrangement.
Why can metals be hammered into sheets and conduct electricity, while an ionic crystal like salt just shatters?
A metal is a lattice of positive ions in a 'sea' of delocalised electrons; when you hammer it, layers slide but the electron sea keeps holding them together, so it bends and flattens, and those mobile electrons carry current.
Why does window glass have no fixed melting point and can even slowly 'flow' over centuries?
Glass is amorphous — its particles are frozen in a disordered, liquid-like arrangement rather than a neat crystal lattice.
How does adding a tiny amount of another element (doping) turn silicon into a useful semiconductor?
Pure silicon has few free carriers.
What does “Crystalline vs amorphous” actually mean in The Solid State, and why does it matter for NEET?
crystalline solids have long-range ordered arrangement and sharp melting points; amorphous solids (glass) lack order and soften over a range.
I keep getting “Crystalline vs amorphous” questions wrong in The Solid State. What's the trap?
calling glass a true crystalline solid.
What does “Types of crystalline solids” actually mean in The Solid State, and why does it matter for NEET?
ionic (electrostatic), covalent-network (diamond), metallic (electron sea) and molecular (weak forces) solids differ hugely in hardness and conductivity.
I keep getting “Types of crystalline solids” questions wrong in The Solid State. What's the trap?
assuming all solids conduct or melt similarly.
What is the difference between Schottky defect and Frenkel defect?
A Schottky defect is a pair of missing cation+anion (lowers density); a Frenkel defect is an ion displaced to an interstitial site (density unchanged) — seen in ionic solids.