The structure of a mixed oxide is cubic close | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) In a $ccp$ lattice,the number of oxide ions $(O^{2-})$ per unit cell is $4$.For a $ccp$ structure,the number of tetrahedral voids is $2 	imes 4 =

Vedclass · Accepted Answer

$AB_2O_2$

Vedclass · Answer

(D) In a $ccp$ lattice,the number of oxide ions $(O^{2-})$ per unit cell is $4$.For a $ccp$ structure,the number of tetrahedral voids is $2 	imes 4 = 8$ and the number of octahedral voids is $4$.Given that $A$ ions occupy $\frac{1}{4}$ of the tetrahedral voids,the number of $A$ ions $= \frac{1}{4} 	imes 8 = 2$.Given that $B$ ions occupy all the octahedral voids,the number of $B$ ions $= 4$.The ratio of $A : B : O$ is $2 : 4 : 4$,which simplifies to $1 : 2 : 2$.Therefore,the formula of the oxide is $AB_2O_2$.

The structure of a mixed oxide is cubic close packed $(ccp)$. The cubic unit cell of the mixed oxide is composed of oxide ions. One-fourth of the tetrahedral voids are occupied by divalent metal $A$ and the octahedral voids are occupied by a monovalent metal $B$. The formula of the oxide is:

Similar Questions

$A$ metal crystallises in an $FCC$ lattice with $ABCABC...$ packing. If the distance between the nearest neighbours is '$a$',then the distance between the centres of the nearest triangular voids of two consecutive layers is:

$A$ compound forms a hexagonal close-packed $(HCP)$ structure. What is the total number of voids in $0.5 \ mol$ of it? How many of these are tetrahedral voids?

In crystalline silicon,$Si$ atoms occupy all the $ccp$ sites and every alternate tetrahedral void. The value of packing efficiency is closest to $....\%$

An ionic solid is $HCP$ of $B^{2-}$ ions and $A^{x+}$ ions are in one-fourth of tetrahedral voids. The value of $x$ should be

What is the total number of spheres that surround the tetrahedral hole in a close-packed three-dimensional structure?

Vedclass Test Series

Exam Paper Generator

Online Exam Module