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Published on: 13/05/2022
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Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test1.
Define the term: space lattice.
2.
Diamond and solid rhombic sulphur are covalent solids but the latter has very low melting point than the former. Explain why?
3.
Define void.
4.
Which point effect in crystal doesn't alter the density of the relevant solid?
5.
What is the total number of atoms per unit cell in a face - centered cubic structure (fcc)?
1.
Space Lattice:
An infinite three dimensional array of points showing how atoms (or) molecules are arranged in a crystal is known as space lattice. The points are known as lattice points.
2.
(I) Diamond has network structure, while sulphur does not.
(II) Due to this, particles of carbon are held at their positions firmly which makes diamond hard, brittle with extremely high melting point.
3.
The empty spaces present between the metal atom or the ions when they are packed within the crystal are called voids.
4.
Frenkel defect
5.
Total number of atoms per unit cell in a fcc structure = 4 atoms.
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