Solid State Chemistry Class 12 Important Questions with Answers pdf
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What type of defect can arise when a solid is heated ?
Vacancy defects can arise when a solid is heated.
Why does LiCl acquire pink colour when heated in Li vapours?
This is due to metal excess defect due to anionic vacancies in which the anionic sites are occupied by unpaired electrons (F-centres).
How many atoms constitute one unit cell of a face-centered cubic crystal?
4 atoms constitute one unit cell of a fee crystal.
What type of stoichiometric defect is shown by AgCl?
Frenkel defect is shown by AgCl.
What type of substances would make better Permanent Magnets: Ferromagnetic or Ferrimagnetic?
Ferromagnetic substances would make better I permanent magnets
Example : Fe, Co, Ni etc.
Calculate the number of atoms in a face centred cubic unit cell.
In face centered cubic arrangement, number of lattice points are : 8 + 6.
∴ Lattice points per unit cell = 8×18+6×12 = 4
On heating a crystal of KC1 in potassium vapour, the crystal starts exhibiting a violet colour. What is this due to?
The Cl ions diffuse to the surface and combine j with atoms which get ionized by losing electrons. ! These electrons are trapped in anions vacancies j and act as F-centre which imparts violet colour to the crystal.
Which type of ionic substances show Schottky defect in solids?
Highly ionic compounds with high coordination rjuniber and small difference in size of cations and anions show schottky defect.
How many atoms per unit cell (z) are present in bcc unit cell?
Number of atoms in a unit cell of a body centred cubic structure :
Contribution by 8 atoms on the corners
= 18 × 8 = 1
Contribution by the atom presents within the body = 1
∴ Total number of atoms present in the unit cell = 1 + 1 = 2 atoms
What type of stoichiometric defect is shown by NaCl?
Schottky defect is shown by NaCl.