19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Packing efficiency of simple cubic lattice is …A… Here, A refers to
The correct order of the packing efficiency in different types of unit cell is …A… Here, A refers to
The maximum proportion of available volume that can be filled by hard spheres in diamond is
Xenon crystallises in the fcc lattice and the edge of the unit cell is 620 pm. The nearest neighbour distance of Xe is
In a face centred cubic arrangement of A and B atoms when A atoms are at the corner of the unit cell and B atoms of the face centres. One of the A atom is missing from one corner in unit cell. The simplest formula o…
In a cubic structure of compound which is made from X and Y, where X atoms are at the corners of the cube and Y at the face centres of the cube. The molecular formula of the compound is
A compound is formed by elements A and B. This crystallizes in the cubic structure when atoms A are the corners of the cube and atoms B are at the centre of the body. The simplest formula of the compound is
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
Assuming the metal atom to be spherical and crystallizes in fcc lattice with edge length 407 pm, its radius will be
A metal has bcc structure and the edge length of its unit cell is 3.04Å. The volume of the unit cell in cm will be
What is the coordination number of body centre cubic lattice?
For tetrahedral coordination the radius ratio r r should be
Sodium metal crystallizes as a body centred cubic lattice with the cell edge 4.29Å. What is the radius of sodium atom.
Percentage of free space in cubic close packed structure and in body centred packed structure are respectively
Edge length of a cube is 400 pm, its body diagonal would be
In a solid ‘AB’ having the NaCl structure, ‘A’ atoms occupy the corners and face centres of the cubic unit cell but all the face-centred atoms along one of the axes are removed and ‘B’ atoms occupy octahedral voids, t…
In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be
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)
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
A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be :
An atom forms face centred cubic crystal with density d = 8.92g/mL and edge length a 3.6 10 cm x . The molecular mass of atom in amu is (JIPMER 2018)
Niobium crystallises in body centred cubic structure. If density is 8.55 g cm-3, then the atomic radius of niobium is (atomic mass of niobium = 93u) (AllMS 2018)
The unit cell of a binary alloy composed of A and B metals, has ccp. Structure with A atoms occupying the corners and B atoms occupying centres of each face of the cube. If during the crystallisation of this alloy, in…
Copper crystallises in fcc lattice with a unit cell edge of 361 pm. The radius of copper atom is