19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Edge length of a cube is 400 pm, its body diagonal would be
Density of NaCl crystal by not considering the unoccupied sites but only the occupied sites = 2.165 × 103 kg m–3. The percentage of unoccupied sites in NaCl crystal is
Density of NaCl crystal assuming all sites are occupied = 2.178 × 103 kg m–3
A sample of electrically neutral NaCl crystal is analysed for its density which has some unoccupied sites. Two readings where taken.
Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å. The radius of sodium atom is approximately:
Total volume of atoms present in a face centred cubic unit cell of a metal is (r = radius of atom) (a) r (b) r (c) r (d) r
If in a crystal lattice of a compound, each corner of a cube is enjoyed by sodium, each edge of a cube has oxygen and centre of cube is enjoyed by tungsten (W), then give its formula [Guj. CET 2011]
Number of unit cells in 4 g of X (atomic mass=40). Which crystallises in bcc pattern is (NA=Avogadro number)
Insulators are the solids with very low conductivities ranging between …A… Here, A refers to
Example of unit cell with crystallographic dimensions , 90º, 90º a b c is
In case of semiconductors, the gap between the valence band and conduction band is …A… Here, A refers to
…A… and …B… are the examples of intrinsic semiconductors. Here, A and B refer to
If we mix pentavalent impurity in a crystal lattice of germanium then what type of semiconductor formation will occur?
A given metal crystallises out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, What is the radius of one atom? (AIPMT 2015)
The vacant space in bcc lattice unit cell is (AIPMT 2015)
Copper crystallises in face centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm? (Manipal 2014)
The number of tetrahedral and octahedral voids in a CCP array of 100 atoms are respectively (Kerala CEE 2014)
Which of the following can be regarded as molecular solid? (EAMCET 2014)
The metal crystallises with a face-centred cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is (CBSE AIPMT 2012)
If a is the length of the side of a cube, the distance between the body centered atom and one corner atom in the cube will be (AIPMT 2014)
The metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g/cm3. The molar mass of the metal is (NA =Avogadro's constant 6.02 10 mol ) x (NEET 2013)
A solid AB has NaCl structure. If the radius of cation A+ is 170 pm. Calculate the maximum possible radius of the anion B (WB JEE 2013)
Which of the following does not show electrical conduction in its physical state ? (CBSE AIPMT 2013)
The number of carbon atoms per unit cell of diamond unit cell is (NEET 2013)
Structure of a mixed oxide is cubic close packed (ccp). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are o…