Question 1 :
In a face centred cubic arrangement of A and B atoms whoso A atoms are at the corner of the unit cell and B atoms at the face centres. One of the B atoms Is missing from one of the faces In the unit cell. The simplest formula of compound is?
Question 2 :
An alloy of copper, silver and gold is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centres and gold is present at body centre, the alloy has a formula:
Question 3 :
The inter-planar spacing between the (2 2 1) planes of a cubic lattice of edge length 450 pm is:
Question 4 :
The pattern of successive layers of ccp arrangement can be designated as
Question 5 :
In a cubic unit cell, seven of the eight corners are occupied by atoms A and centers of faces are occupied by atoms B. The general formula of the compound is :
Question 6 :
The numbers of tetrahedral and octahedral holes in a ccp array of 100 atoms are respectively?
Question 7 :
If three elements $X, Y$ and $Z$ crystallizes in a $ccp$ lattice with the X atoms at the corner, $Y$ atoms at the cube centre and $Z$ atom at the edge centre the formula of the compound will be:
Question 8 : <div>Statement: All atoms in a Bravais lattice has the same coordination number.<br/></div><div><br/></div><div>State whether the given statement is true or false.</div>
Question 9 :
In hcp lattice, if a plane is drawn parallel to layers $A$ and $B$, at a distance $\dfrac{c}{8}$ above the layer $B$, it passes through centres of $x$ tetrahedral and $y$ octahedral voids. A plane parallel to layer $A$, at a distance $\dfrac{c}{8}$ just below it passes through central of $p$ tetrahedral and $q$ octahedral voids. Find $( x + y + p + q)$. $c$ is the call
Question 10 :
Assertion: There are seven types of crystal system and $14$ types of Bravais lattices.
Reason: Rhombohedral, triclinic and hexagonal crystal systems have only primitive unit cell.
Question 11 :
Edge length of a cubic unit cell is $400$ pm. Its face diagonal would be:
Question 12 :
In closed packed lattice containing $'n'$ particles, the numbers of tetrahedral and octahedral voids are
Question 13 :
If radius ratio is less than $0.155$, the co-ordination number is :
Question 14 :
An ionic compound has a unit cell consisting of $A$ ions at the corners of a cube and $B$ ions on the centres of the faces of the cube. The empirical formula for this compound would be:
Question 16 :
A mineral having formula $AB_{2}$ crystallises in the cubic close-packed lattice, with the $A$ atoms occupying the lattice points. Hence coordination number of $A$ and $B$ atoms are:
Question 17 :
The structure of $MgO$ is similar to $NaCl$. What would be the coordination number of magnesium?
Question 19 :
The more efficient mode of packing of identical atoms in one layer is :
Question 20 : <div>Statement: Tetrahedral voids and octahedral voids, both are found is hcp and simple cubic structure.<br/></div><div><br/></div><div>State whether the given statement is true or false.</div>
Question 21 :
With which one of the following elements silicon should be doped so as to give p-type semiconductor?
Question 23 :
A binary solid has zinc blend structure with $B^-$ ions constituting the lattice and $A^+$ ions occupying $25\%$ tetrahedral voids. The formula of solid is:
Question 24 :
If the coordination of $Ca^{2+}$ in $CaF_{2}$ is $8$, then the coordination number of $F^{-}$ ions would be:
Question 26 : A cubic unit cell contains manganese ions at the corners and fluoride ions at the centre of each edge. <div>(a) What is the empirical formula of the compound? </div><div>(b) What is the coordination number of the $Mn$ ion?</div>
Question 27 :
The edge of a unit cell of FCC $Xe$ crystal is $620\ pm$. The radius of $Xe$ atom is:
Question 28 :
Coordination numbers of $Zn^{2+}$ and $S^{2-}$ in the crystal structure of wurtzite are :
Question 29 :
A metal crystallises into a lattice containing a sequence of layer as $ABABAB....$. What percentage of voids are left in the lattice?
Question 31 :
Structure of a mixed oxide is cubic close-packed (CCP). The cubic unit cell of 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 mono-valent metal B. The formula of the oxide is ?
Question 33 : <p class="wysiwyg-text-align-justify">The number of octahedral sites in a cubical close-pack array of $N$ spheres is:</p>
Question 35 :
In a compound $AB$, the ionic radii of $A^+$ and $B^-$ are $88$ pm and $200$ pm respectively the coordination number of $A^+$ is:
Question 36 : <div><b>Assertion</b>: $6 : 6$ co-ordination at normal temperature and pressure changes to $8 : 8$ co-ordination at high pressure.</div><div><b>Reason: </b>Pressure influences the structure of solids.</div>
Question 38 :
Two ions $A^-$ and $B^-$ have radii 104 and 200 pm respectively, in a cubic close-packed crystal of compound $AB$. The co-ordinate number of $A^+$ is:
Question 40 :
In the spinel structure, oxides ions are cubical-closest packed whereas $1 / 8th$ of tetrahedral voids are occupied by $A^{2+}$ cation and $1 / 2$ of octahedral voids are occupied by $B^{3+}$ cations. The general formula of the compound having spinel structure is :
Question 41 :
The co-ordination number of the cation in the Face centered cubic(FCC) lattice is:
Question 42 :
In $A^{+}B^{-}$ ionic compound, radii of $A^{+}$ and $B^{-}$ ions are $180\ pm$ and $187\ pm$ respectively. The crystal structure of this compound will be:
Question 43 : <div>Statement: The maximum number of Bravais lattices is shown by tetragonal type crystals.<br/></div><div><br/></div><div>State whether the given statement is true or false.<br/></div>
Question 44 : In the rock salt $AB$, if $C$ is introduced in tetrahedral voids, such that no distortion occurs. <div><br/></div><div>Then the formula of the resultant compound is:</div>
Question 45 :
A cubic solid is made by atoms A forming closed packed arrangement, B occupying one/fourth of tetrahedral void and C occupying half of the octahedral voids. What is the formula of the compound :-
Question 46 :
KF has ccp structure. How many $F^-$ ions and octahedral voids are there in this unit cell respectively?
Question 47 :
The atomic radius of strontium $(Sr)$ is $215 \,pm$ and it crystallizes with a cubic closest packing. Edge length of the cube is:
Question 48 :
In a ccp type structure, if half of the face-centred atoms are removed, then percentage void in unit cell is approximately:
Question 49 :
A metal $X$ crystallises in a face-centred cubic arrangement with the edge length $862\ pm$. What is the shortest separation of any two nuclei of the atom?
Question 50 :
Assertion: A tetrahedral void is surrounded by four sphere and an octahedral void is surrounded by six spheres.
Reason: The number of tetrahedral voids is double the number of close-packed spheres and the number of octahedral voids is equal to the number of close-packed spheres.
