HARD
Earn 100

Briefly explain how the packing of the constituent particles in a crystal takes place.

Important Questions on Solid State

HARD

A metal M forms hexagonal close-packed structure. The total number of voids in 0.02 mol of it is _____ ×1021 (Nearest integer)

(Given NA=6.02×1023)

HARD
How will you distinguish between the following pair of term?
Hexagonal close-packing and cubic close packing?
 
HARD

In a face centered cubic (fcc) lattice, the position which represents an octahedral hole is

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EASY
A two-dimensional solid pattern formed by two different atoms X and Y is shown below. The black and white squares represent atoms X and Y , respectively. The simplest formula for the compound based on the unit cell from the pattern is

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EASY
A compound made up of elements A and B (with a general formula AxBy), where B form a hcp lattice and A occupy2/3rd of the tetrahedral voids. The formula of the compound is
MEDIUM
Ga (atomic mass 70 u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is ________ ×1021. (Round off to the Nearest Integer).
HARD
A material having simple cubic lattice, is heated such that 1 site out of 8 sites becomes vacant. Assuming that the volume does not change, the packing fraction f of the material is [packing efficiency (100f)% ]
EASY
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:
HARD
A compound crystallises in a hcp arrangement. The total number of voids present in 0.5 mole of the crystal is
MEDIUM
Atoms of element B form hcp lattice and those of the element A occupy 13rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?
MEDIUM
In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is:
EASY
Atoms of an element Z form hexagonal closed packed hcp lattice and atoms of element X occupy all the tetrahedral voids. The formula of the compound is
EASY
A crystalline solid is made up of X and Y atoms, X atoms possesses CCP structure and Y atoms are arranged in tetrahedral voids. If all the atoms situated on a diagonal of one side are removed, what will be the molecular formula of the crystalline solid?
HARD
In a cubic closed packed structure of mixed oxide, the oxide ions are in CCP arrangement. 16 of tetrahedral voids are occupied by cations A and 12 of octahedral voids are occupied by cations B. The formula of the oxide is
MEDIUM
What is the number of octahedral void(s) per atom present in a cubic close-packed structure ?
MEDIUM
In CCP arrangement, the total number of octahedral voids are _________
MEDIUM
The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in Ax B. The value of x is (Integer answer)
EASY
Draw a diagram of "two-dimension square closed packing".
HARD

A two dimensional solid is made by alternating circles with radius a and b such that the sides of the circles touch. The packing fraction is defined as the ratio of the area under the circles to the area under the rectangle with sides of length x and y.

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The ratio r=b/a for which the packing fraction is minimized is closest to:

EASY
In a compound, atoms of elements Y form ccp lattice and those of element X occupy 2/3 rd of tetrahedral voids. The formula of the compound can be