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The lambda form of iron has fcc strcutre...

The `lambda` form of iron has fcc strcutre (edge length 386 pm) and `beta-` form has bcc structure (edge length 290pm). 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

`Z_(eff)` for fcc=4 and for bcc=2/unit cell
`(rho_(gamma))/(rho_(beta))=(rho_("fcc"))/(rho_("bcc"))=(Z_(eff("fcc")))/(Z_(eff("bcc")))xx((a_("bcc"))/(a_("fcc")))^(3)=(4)/(2)xx((290)/(286))^(2)=0.9788`
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