19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Zinc oxide loses oxygen on heating according to the reaction, heat ZnO Zn O 2e -> It becomes yellow on heating because
The correct statement regarding F-centre is
In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is
Which defect causes decrease in the density of crystal
Which of the following fcc structure contains cations in alternate tetrahedral voids ?
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
If the radius of K+ and F– are 133 pm and 136 pm respectively, the distance between K+ and F– in KF is
For an ionic crystal of the general formula AX and coordination number 6, the value of radius ratio will be
The maximum radius of sphere that can be fitted in the tetrahedral hole of cubic close packing of sphere of radius r is.
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
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
The interionic distance for caesium chloride crystal will be
The number of formula unit in unit cell of CsCl, type is
In CsCl structure, the coordination number of Cs+ is
In NaCl lattice the coordination number of Cl– ion is
The structure of MgO is similar to NaCl. What would be the coordination number of magnesium.
The number of carbon atoms per unit cell of diamond unit cell is (NEET 2013)
How many chloride ions are there around sodium ion in sodium chloride crystal.
In NaCl lattice the radius ratio is Na Cl r r =
Which of the following statements is not true about NaCl structure
The unit cell of a NaCl lattice
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is
For a solid with the following structure, the co- ordination number of the point B is
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compounds would be
Aluminium has fcc structure. The length of the unit cell is 404 pm. If the density of the metal is 2.7 g cm–3, the molar mass of Al atom is