Home
Class 12
CHEMISTRY
The gamma-form of iron has fcc structure...

The `gamma`-form of iron has `fcc` structure (edge length `386 pm`) and `beta`-form has `bcc` structure (edge length `290 pm`). The ratio of density in `gamma`-form and `beta`-form is

A

`0.9788`

B

`1.02`

C

`1.57`

D

`0.6344`

Text Solution

Verified by Experts

The correct Answer is:
A
`Z_(eff)` for fcc `= 4` and forbcc `= 2//"unit cell"`
`(rho_(lambda))/(rho_(beta))=(rho_(fc c))/(rho_(fc c))=(Z_(eff(fc c))/(Z_(eff(bc c))))xx((a_(bc c))/(a_(fc c)))^(3)`
`= 4/2 xx ((290)/(386))^(3) = 0.9788`
Promotional Banner

Similar Questions

Explore conceptually related problems

CsBr has bcc structure with edge length of 43 pm . The shortest interionic distance between cation and anion is

Which form of RNA has a structure resembling clover leaf ?

An element (atomic mass = 100 // mol) having bcc structure has unit cell edge 400 pm. The density of the element is :

The edge length of NaCl unit cell is 564 pm. The density of NaCl in gcm^-3 is

A binary solid A^+B^-) has a rock structure. If the edge length is 400 pm and radius of cation is 75 pm, the radius of anion is

A face-centred cubic element (atomic mass 60 ) has a cell edge of 400 pm. What is its density?

An element occurs in bcc structure. It has a cell edge length of 250 pm. Calculate the molar mass if its density is 8.0 g cm^(-3) . Also calculate radius of an atom of this element.

KF has NaCl structure. The edge length of its unit cell has been found to be 537.6 pm. The distance between K^(+) and F^(-) in KF is :