Question 1 :
Tetragonal crystal system has which of the following unit cell dimensions?
Question 2 :
<div> Statement: The melting point of all substances decreases with pressure increase.<br/></div><div> <br/></div><div> State whether the given statement is true or false.</div>
Question 4 :
First three nearest neighbour distances for body centred cubic lattices are respectively:
Question 5 :
Mostly crystals show good cleavage because their atoms, ions or molecules are:
Question 6 :
How many unit cells are present in a cubic shaped ideal crystal of NaCl of mass 1.0 g?
Question 8 :
What is the difference between the number of atoms per unit cell in face centred cube and the number of atoms per unit cell in body centred cube ?
Question 9 :
The edge length of face-centred unit cubic cell is $508\ pm$. If the radius of the cation is $110\ pm$, the radius of the anion is:
Question 10 :
How many lithium atoms are present in a unit cell with edge length $3.5 \mathrm { A }$ and density $0.53 \mathrm { gcm } ^ { - 3 }$ ? (Atomic mass of $L i = 6.94 )$<br/>
Question 11 :
An AB solid has $NaCl$ type of unit cell. If atoms from the edge centers along an axis connecting the opposite edge centers on a face are removed, the empirical formula of the remaining solid would be : <br/>
Question 12 :
In a body-centred cubic arrangement the ion $A$ occupies the centre while the ions of $B$ occupy the corners of a cube. The formula of the crystal is
Question 13 :
Edge length of a cube is $400$ pm. Its body diagonal (in pm) would be:
Question 14 :
<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 16 :
The number of atoms/molecules contained in one body-centred cubic unit cell is:
Question 17 :
The ratio of co-ordination number of Al and number of Al atoms per unit cell in fcc lattice is :<br/>
Question 18 :
For bcc structure, the coordination number and packing are ______ respectively.
Question 19 :
In a solid AB having $NaCl$ structure, 'A' atoms occupy the corners of the cubic unit cell.If all the face-centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is :
Question 20 :
The number of atoms per unit cell in a simple cube, face-centred cube and body-centred cube are respectively.
Question 21 :
A metal of density $7.08\ g\ cm^{-3}$ at $298\ K$ crystallizes in a body centered cubic lattice with lattice constant $2.9\overset {\circ}{A}$. The metal is (atomic mass is given in parenthesis) :
Question 22 :
Assertion: The total number of atoms present in a simple cubic unit cell is one.
Reason: Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.
Question 23 :
In a compound, atoms of element Y form ccp lattice and those of element X occupy $2/3^rd$ of tetrahedral voids. The formula of the compound will be:
Question 24 :
The inter-planar spacing between the (2 2 1) planes of a cubic lattice of edge length 450 pm is:
Question 25 :
<div> The total number of atoms in a face-centred cubic unit cell is equal to three.<br/></div>