1.

Match the entries listed in Column I with appropriate entries listed in Column II

Answer» Correct Answer - `Ararrr;Brarrp;Crarrq;Drarrs`
`Ararrr,Brarrp,Crarrq,Drarrs`
(A) Atom A/unit cell `=8xx(1)/(8)=1`
Atoms B/unit cell `=6xx(1)/(2)=3`. Formula `=AB_(3)`
(B) Atoms A/unit cell `=8xx(1)/(8)+6xx(1)/(2)=4`
Atoms B/unit cell `=12xx(1)/(4)=3`. Formula `=A_(4)B_(3)`
(C) Suppose anions B=n.
Octahedral voids =n, Tetrahedral voids=2n
Cation A=n(in octahedral voids)+n (in tetrahedral voids)`=2n therefore A:B=2n:n=2:1` Formula =`A_(2)B`
(D) Suppose cations `A=n`
Tetrahedral voids =2n ,brgt Anions B=2n
`therefore A:B=n:2n=1:2`
Formula `=AB_(2)`.


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