Recent questions tagged solid-state

A metal crystallises into two cubic phases , face-centered cubic (fcc) and body centered (bcc) whose unit lengths are $3.5 \;and\;3.0 A^{\large\circ}$ respectively . Calculate the ratio of densities of fcc and bcc.

asked Apr 9, 2014 by sharmaaparna1

1 answer

Cu metal crystallises in face centered cubic lattice with cell edge , a = 361.6 pm . What is the density of Cu crystal ? (Atomic mass of copper = 63.5 amu , $N_A = 6.023\times10^{23}$

asked Apr 9, 2014 by sharmaaparna1

1 answer

The density of crystalline sodium chloride is $2.165g cm^{-3}$ . What is the edge length of the unit cell.

asked Apr 9, 2014 by sharmaaparna1

1 answer

Silver crystallises in a face centered cubic unit cell . The density of Ag is $10.5 g cm^{-3}$. Calculate the edge length of the unit cell .

asked Apr 8, 2014 by sharmaaparna1

1 answer

The density of a pure substance 'A' whose atoms pack in cubic close pack arrangement is 1g m/cc . If B atoms can occupy tetrahedral voids and all the tetrahedral voids are occupied by 'B' atoms what is the density of resulting solid in gm/cc . [Atomic mass (A) = 30 gm/mol and atomic mass (B) = 50gm/mol]

asked Apr 7, 2014 by sharmaaparna1

1 answer

An alloy of Copper , Silver and Gold is found to have Copper constituting the C.C.P lattice. If Silver atoms occupy the edge centres and Gold is present at body centre , the alloy will have the formula:

asked Feb 28, 2014 by sharmaaparna1

1 answer

The compound formed by elements X and Y crystallizes in cubic structure in which X atoms are at the corners of the cube and Y atoms are at the face centre . The formula of the compound is

asked Feb 28, 2014 by sharmaaparna1

1 answer

In a face centred cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms at the face centered. One of the A atom is missing from one corner in unit cell. The simplest formula of compound is

asked Feb 28, 2014 by sharmaaparna1

1 answer

The ratio of closed packed atoms to tetrahedral holes in cubic close packing is

asked Feb 28, 2014 by sharmaaparna1

1 answer

The Vacant space in body centered cubic lattice b.c.c unit cell is about

asked Feb 27, 2014 by sharmaaparna1

2 answers

Vanadium crystallises with a body centered cubic structure with a unit cell of side length $3.011A^{\large\circ}$. Calculate the atomic radius and density (V = 50.94)

asked Feb 27, 2014 by sharmaaparna1

1 answer

The densities of NaCl crystal as measured by Spectrometer and X - ray method are $2.165\times10^3 kgm^{-3}$ and $2.178\times10^3 kgm^{-3}$, respectively . The fraction of unoccupied sites in sodium chloride crystal is

asked Feb 27, 2014 by sharmaaparna1

1 answer

$CsBr$ crystallises in a body centered cubic lattice. The unit cell length is $436.6\; pm$ . Given that the atomic mass of $Cs = 133$ and of $Br = 80\; amu$. Avogadro's number being $6.02\times10^{23}mol^{-1}$ The density of $CsBr$ is

asked Feb 27, 2014 by sharmaaparna1

1 answer

Silver (atomic weight = $107.88$) crystallises with f.c.c lattice for which the side length of the unit cell is $4.0774\overset{\circ}{A}$. Density of $Ag$ is $10.53\; g\;cm^{-3}$. Calculate the Avogadro's number.

asked Feb 27, 2014 by sharmaaparna1

1 answer

A match box exhibits :

asked Feb 27, 2014 by sharmaaparna1

1 answer

The angle at which first order reflection will occur when X-ray of wavelength $1.54A^{\large\circ}$ are diffracted by the atoms of a crystal ; the interplanar distance is $4.04A^{\large\circ}$

asked Feb 27, 2014 by sharmaaparna1

1 answer

CsBr has b.c.c structure with edge length $4.3 A^{\large\circ}$. The shortest inter ionic distance between $Cs^+$ and $Br^-$ is

asked Feb 27, 2014 by sharmaaparna1

1 answer

A metal M(at.wt = 40.0) depending on temperature crystallises in f.c.c and b.c.c structure whose unit cell length are 3.5 and $3.0 A^{\large\circ}$ respectively. The ratio of its densities in f.c.c and b.c.c structures is

asked Feb 25, 2014 by sharmaaparna1

1 answer

A unit cell of NaCl has four formula units. The edge length of unit cell is 0.564. The density of NaCl is

asked Feb 25, 2014 by sharmaaparna1

1 answer

At room temperature , Sodium crystallizes in a b.c.c lattice with edge length $a = 4.24A^{\large\circ}$ . Find the theoretical density of sodium.

asked Feb 25, 2014 by sharmaaparna1

1 answer

The density of KBr is 2.73g/cm. The length of the unit cell is 654pm. Find the number of atoms per unit cell in the cubic structure.

asked Feb 25, 2014 by sharmaaparna1

1 answer

In CsCl with cubic structure $Cl^-$ ions are located at each corner and $Cs^+$ ions at the centre of the unit cell. If $r_{Cs^+}$ and $r_{Cl^-}$ are $1.69A^{\large\circ}$ and $1.81A^{\large\circ}$ respectively . Find the value of edge length of cube.

asked Feb 25, 2014 by sharmaaparna1

1 answer

The density of cr atoms is 7.2g/cm. If the unit cell has edge length 289 pm. Calculate the number of chromium atoms per unit cell. (at mass of cr = 52)

asked Feb 24, 2014 by sharmaaparna1

1 answer

Chromium metal crystallizes with a b.c.c lattice. The edge length of the unit cell is found to be 287pm. Calculate the density of chromium in $g\;cm^{-3}$(at weight of cr = 52).

asked Feb 24, 2014 by sharmaaparna1

1 answer

If the radius of $Cs^+$ is 169pm and that of $Cl^-$ is 181pm then find the co-ordination number of $Cs^+$

asked Feb 18, 2014 by sharmaaparna1

1 answer