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)`.

Correct Answer – `Ararrq;Brarrp;Crarrs;Drarrs`
`Ararrq,Brarrp,Crarrs,Drarr r`
(A) Intercepts of the shaded plane =a,b,c. Miller indices =111.
(B) Intercepts of the shaded plane =a,-b,c or -a,b,-c. miller indices=111 or 111.
(C) Intercepts of the shaded plane =a,-b,-c or -a,b,c.
Miller indices =111 or 111
(D) Intercepts of the shaded plane =a,b,-c or -a,-b,c
Miller indices =111 or 111.

Correct Answer – A `rarr` t; B `rarr` r; C `rarr` p; D `rarr` p
(A) For ideal gas, `((delU)/(delV))_(T)=0`
(B) In adiabatic process, q = 0. Therefore, from the first law of thermodynamic, `DeltaU=q-w and q=0`
`therefore DeltaU=-w`
(C ) In isothermal process, `DeltaU=0`, because internal energy is the function of temperature
(D) `DeltaG^(Theta)=-nFE^(Theta)`
(E) `((delT)/(delP))_(H)ne0` for real gases.