In a close packed array of 'N' sphere the number of tetrahedral voids are

Body diagonal of a cube is 866pm. Its edge length would be

Out of the following a non-crystalline solid is

CsBr crystal has BCC structure. Its edge length is 4.3 A^o. The shortest inter ionic distance between Cs⁺ and Br^- ions is

The phenomenon in which crystals produce electricity on applying pressure is

The type of cubic lattice having maximum number of atoms per unit cell is

In a crystal the cations A⁺ are arranged at the corner and the anions B^- are occupied in all the octahedral voids and half of the tetrahedral voids. The formula of the compound is

Silicon when doped with Arsenic gives

In a solid AB having rock salt structure, 'A' atoms occupy the corners of the cubic unit cell. If all the face-centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

The number of particles present per unit cell of a body centered cube is