Solid State

The CORRECT statement(s) for cubic close packed (ccp) three dimensional structure is(are)

Which of the following compounds is metallic and ferromagnetic ?

If the unit cell of a mineral has cubic close packed (ccp) array of oxygen atoms with $m$ fraction of octahedral holes occupied by aluminium ions and $n$ fraction of tetrahedral holes occupied by magnesium ions, $m$ and $n$, respectively, are

Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29Å. The radius of sodium atom is approximately :

CsCl crystallises in body centred cubic lattice. If 'a' is its edge length then which of the following expressions is correct ?

In a face centered cubic lattice atoms A are at the corner points and atoms B at the face centered points. If atom B is missing from one of the face centered points, the formula of the ionic compound is :

The appearance of colour in solid alkali metal halides is generally due to :

In a monoclinic unit cell, the relation of sides and angles are respectively :

The total number of octahedral void(s) per atom present in a cubic close packed structure is :

The arrangement of $\ce{X-}$ ions around $\ce{A+}$ ion in solid AX is given in the figure (not drawn to scale). If the radius of $\ce{X-}$ is 250 pm, the radius of $\ce{A+}$ is

A compound $\ce{M_pX_q}$ has cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below. The empirical formula of the compound is

The number of hexagonal faces that are present in a truncated octahedron is

The packing efficiency of the two-dimensional square unit cell shown below is

The correct statement(s) regarding defects in solids is(are)

The number of atoms in this HCP unit cell is

The volume of this HCP unit cell is

The empty space in this HCP unit cell is

STATEMENT-1: Band gap in germanium is small.

because

STATEMENT-2: The energy spread of each germanium atomic energy level is infinitesimally small.

Match the crystal system/unit cells mentioned in Column I with their characteristic features mentioned in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 × 4 matrix given in the ORS.