19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Bravais lattices are of
The number of atoms or molecules contained in one body centered cubic unit cell is
Diamond is an example of
Which of the following is an example of covalent crystal solid
Particles of quartz are packed by
Contribution of each atom per unit cell at face centre in a fcc unit cell is
In graphite, carbon atoms are joined together due to
Amorphous solids are
Among solids the highest melting point is established by
Mostly crystals show good cleavage because their atoms, ions or molecules are
A crystalline solid
Amorphous substances show (1) Short and long range order (2) Short range order (3) Long range order (4) Have no sharp M.P.
In hcp arrangement, the number of nearest neighbours are
Doping of silicon (Si) with boron (B) leads to
Crystalline solid is
Which of the following has the highest value of energy gap?
A solid is formed by two elements P and Q. The element Q forms cubic close packing and atoms of P occupy one third of tetrahedral voids. The formula of the compound is [AMU 2010]
Crystals can be classified into basic crystal habits equal to
Tetragonal crystal system has the following unit cell dimensions
The number of atoms contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is
If the number of atoms per unit cell in a crystal is 2, the structure of crystal is
The two dimensional coordination number of a molecule in square close packed layer is
In ccp arrangement the pattern of successive layers can be designated as
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
The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is