How many statements are correct A . In an antifluorite structure, cations are present in all TV s.
B. If the radius of cation is 0.35 pm of anion is 0.95 pm, then the CN of the crystal is 4.
C. An atoms or ion is transferred from a lattice site to an interstitial position in Frenkel defect .
D. The density of a crystal always decrease in point defects.

Answer

3

Explanation

Statements (a),(b) and (c) are correct.
So total score=1+2+3=6
Statements (a,b) are factural.
Statement (c): `(r_(o+))/(r_(-))=(0.35)/(0.95)=0.368`
The radius ratio lies in the range of 0.225-0.414, Which corresponds to TV and the CN of TV=4.