19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Schottky defect in crystals is observed when (RPMT 2010)
Potassium has a bcc structure with nearest neighbour distance 4.52 Å. Its atomic weight is 39. Its density will be
The number of atoms in 100 g of an FCC crystal with density d = 10 g cm –3 and cell edge as 200 pm is equal to
An element (atomic mass = 100 g/mol) having bcc structure has unit cell edge 400 pm. Then density of the element is
The unit cell of aluminium is a cube with an edge length of 405 pm. The density of aluminium is 2.70 g cm –3. What is the structure of unit cell of aluminium?
How many lithium atoms are present in a unit cell with edge length 3.5 Å and density 0.53 gcm –3? (Atomic mass of Li = 6.94)
An element has a body-centred cubic (bcc) structures with a cell edge of 444 pm. The density of the element is 7.2 g/cm3. How many atoms are present in 404 g of the element?
An element with atomic mass 100 has a bcc structrue and edge length 400 pm. The density of element is
Ag forms ccp lattice and X-ray studies show that the edge length of its unit cell is 408.6 pm. Find the density of silver. (Given that atomic mass of silver = 107.9 u)
A face-centred cubic element (atomic mass 60) has a cell edge of 400 pm. What is its density?
For a solid with the following structure, the co- ordination number of the point B is
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is
Aluminium has fcc structure. The length of the unit cell is 404 pm. If the density of the metal is 2.7 g cm–3, the molar mass of Al atom is
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compounds would be
Amorphous substances show (1) Short and long range order (2) Short range order (3) Long range order (4) Have no sharp M.P.
Contribution of each atom per unit cell at face centre in a fcc unit cell is
If the number of atoms per unit cell in a crystal is 2, the structure of crystal is
The number of atoms or molecules contained in one body centered cubic unit cell is
The number of atoms contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is
Solid CO2 is an example of
In graphite, carbon atoms are joined together due to
Particles of quartz are packed by
Which of the following is an example of covalent crystal solid
Diamond is an example of
Which of the following is an example of metallic crystal solid