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Empirical Formula

26. In a cubi...

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26. In a cubic unit cell , A atoms are atoms are present on alternate corners,B atoms are present on alternate face centers and C atoms are present on alternative edge centers and body centers of the cube . The simplest formula of the compound is:- (1)ABCD (2)A2BC4 (3)AB2C4 (4)none

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Q. In a cubic unit cell,

A

atoms are present on alternate faces and

C

atoms are present on alternate edges and body center of the cube. the simplest formula of a compound is:

Q. A compund has a cubical unit cell in which A atoms are present at face center(s) and body centre. B atoms are present at 4 corners and at one-sixth of the edge centers . The simplest formula for the compound is :

In a unit cell, atoms A are present at all corner lattices, B atoms are present at alternate faces and all edge centers. Atoms C is present at face centers left from B and one at each body diagonal at a distance of

\frac{1}{4}

th of body diagonal from the corner.

The formula of the given solid is :

Q. Find the lowest possible empirical formula in an arrangement of unit cell where A atoms are present at corners and alternate face centers, B atoms are present at alternate edge centres and C atoms are present at half of the mid of line joining opposite face centers. Assume: Any atom present in the inner locations of the unit cell should be considered completely within the unit cell structure.

Q. Find out the simplest formula of the compound, if one of the X atoms is missing from a corner in each unit cell in a face centered lattice of X and Y, X atoms are present at the corners while Y atoms are at face centers?

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