19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
If the value of ionic radius ratio c a r r is 0.52 in an ionic compound, the geometrical arrangement of ions in crystal is
If the radius of K⁺ and F– are 133 pm and 136 pm respectively, the distance between K⁺ and F– in KF is
The interionic distance for caesium chloride crystal will be
In A+ B– ionic compound, radii of A+and B– ions are 180 pm and 187 pm respectively. The crystal structure of this compound will be
Ferrous oxide has a cubic structure and each edge of the unit cell is 5.0 Å. Assuming density of the oxide as 4.0 g cm–3, then the number of Fe²⁺ and O₂– ions present in each unit cell will be
Schottky defect in crystals is observed when
Which of the following statements is not true about NaCl structure
In NaCl lattice the radius ratio is Na Cl r r =
The maximum radius of sphere that can be fitted in the tetrahedral hole of cubic close packing of sphere of radius r is.
The unit cell of a NaCl lattice
In NaCl lattice the coordination number of Cl– ion is
In CsCl lattice the coordination number of Cl– ion is
Which of the following fcc structure contains cations in alternate tetrahedral voids ?
If the coordination number of Ca²⁺ in CaF₂ is 8, then the coordination number of F– ion would be
What is the coordination number of sodium in Na₂O
In CsCl structure, the coordination number of Cs⁺ is
A solid A+B– has the B– ions arranged as below. If the A+ ions occupy half of the octahedral sites in the structure. The formula of solid is
For the structure of solid given below if the lattice points represent A+ ions & the B– ions occupy all the tetrahedral voids then coordination number of A is
The number of octahedral voids in a unit cell of a cubical closest packed structure is
The number of formula unit in unit cell of CsCl, type is
Which of the following defects are also called thermodynamic defects?
If ‘a’ stands for the edge length of the cubic systems: simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these system will be respectively. [CBSE AIPMT 2008]
The number of atoms per unit cell of bcc structure is [Kerala CEE 2009]
A compound of ‘A’ and ‘B’ crystallizes in a cubic lattice in which the ‘A’ atoms occupy the lattice points at the corners of the cube. The ‘B’ atoms occupy the centre of each face of the cube. The probable empirical f…
In hcp arrangement, the number of nearest neighbours are