19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 defects are also called thermodynamic defects?
Which of the following has the highest value of energy gap?
Doping of silicon (Si) with boron (B) leads to
Those substances which show permanent magnetism even in the absence of magnetic field are called
Electrons in a paramagnetic compound are
AB crystallises in a body-centred cubic lattice with edge 'a' equal to 387 pm. The distance between two oppositely charged ions in the lattice is (CBSE AIPMT 2010)
Number of unit cells in 4 g of X (atomic mass = 40) which crystallises in bcc pattern is (NA = Avogadro's number) (OJEE 2010) (a) A 0.1N (c) A 2 0.1N x (b) A 0.1N (d) A N x
Schottky defect in crystals is observed when (RPMT 2010)
Types of point defects are
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]
Which one of the following is a covalent crystal? [KCET 2011]
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)
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
Number of unit cells in 4 g of X (atomic mass=40). Which crystallises in bcc pattern is (NA=Avogadro number)
Assuming the metal atom to be spherical and crystallizes in fcc lattice with edge length 407 pm, its radius will be
Copper crystallises in face centred cubic lattice with a edge length of 361pm. What is the radius of copper atom in pm?
A metal crystallizes in a face-centered unit cell. Its edge length is 0.410 nm. The radius of the metal is
The number of atoms present in unit cell of a monoatomic substance of simple cubic lattice is
The number of octahedral voids in a unit cell of a cubical closest packed structure is
Sodium metal crystallizes as a body centred cubic lattice with the cell edge 4.29Å. What is the radius of sodium atom.
In ABC packing if the number of atoms in the unit cell is n then the number of tetrahedral voids in the unit cell is equal to
The ratio of close-packed atoms to tetrahedral holes in cubic close packing is
The number of tetrahedral voids in the unit cell of a face centred cubic lattice of similar atoms is