19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Crystalline solid is
Amorphous solids are
Amorphous substances show (1) Short and long range order (2) Short range order (3) Long range order (4) Have no sharp M.P.
Which of the following is a pseudo solid
An alloy of Cu, Ag and Au is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centre and gold is present at body centre, the alloy has a formula
The formula for determination of density of unit cell is (a) a N g cm N M A x x (b) M g cm a N A Z x x (c) a M g cm N N A x x (d) M N g cm a N A x x
In ccp arrangement the pattern of successive layers can be designated as
The two dimensional coordination number of a molecule in square close packed layer is
In hcp arrangement, the number of nearest neighbours are
What is the coordination number of body centre cubic lattice?
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
In a cubic lattice of ABC, A atoms are present at all corners except one corner which is occupied by B atoms. C atoms are present at face centers. The formula of the compound is
A metal crystallises into a lattice containing a sequence of layer as AB ABAB....... . What percentage of voids are left in the lattice?
Number of atoms in the unit cell of Na (bcc type crystal) and Mg (fcc type crystal) are, respectively
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is
The number of atoms present in unit cell of a monoatomic substance of simple cubic lattice is
The number of atoms per unit cell in primitive (sc), body-centered (bcc), face-centered (fcc) and end- centered (ecc) unit cell decreases as
In a face-centred cubic lattice, a unit cell is shared equally by how many unit cells
Tetragonal crystal system has the following unit cell dimensions
Crystals can be classified into basic crystal habits equal to
Bravais lattices are of
A particular solid is very hard and has a high melting point. In solid state, it is a non-conductor and its melt is a conductor of electricity. Classify the solid.