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Crystalline and Amorphous Solid

Total number ...

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Total number of atoms purely present in a hexagonal close packing unit cell which are not shared by adjacent unit cell is/are 1 2 3 6

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In the cubic close packing, the unit cell has

(a) 4 tetrahedral voids each of which is shared by four adjacent unit cell

(b) 4 tetrahedral voids within the unit cell

(c) 8 tetrahedral voids each of which is shared by four adjacent unit cells

(d) 8 tetrahedral voids within the unit cells

Q. An element crystallizes in 3-D hexagonal closed packed structure but 2 atoms from the corner of the hexagonal unit cell are absent.
The packing fraction of such lattice would be :

Q. Assertion (A): The total number of atoms present in a simple cubic unit cell is one. Reason (R): Simple cubic unit cell has atoms at its comers, each of which is shared between eight adjacent unit cells.

Q. Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): The total number of atoms present in a simple cubic unit cell is one.
Reason (R): Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.

Q. Assertion (A): Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four. Reason (R): Besides the body centre, there is one octahedral void present at the centre of each ofthe six faces of the unit cell and each of which is shared between two adjacent unit cells.

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