19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following has the highest value of energy gap?
If we mix pentavalent impurity in a crystal lattice of germanium then what type of semiconductor formation will occur?
…A… and …B… are the examples of intrinsic semiconductors. Here, A and B refer to
In case of semiconductors, the gap between the valence band and conduction band is …A… Here, A refers to
Insulators are the solids with very low conductivities ranging between …A… Here, A refers to
Types of point defects are
In a Schottky defect,
The structure of MgO is similar to NaCl. What would be the coordination number of magnesium.
How many chloride ions are there around sodium ion in sodium chloride crystal.
For the structure given below the site marked as S is a
Which of the following statements is not true about the voids?
In ABC packing if the number of atoms in the unit cell is n then the number of tetrahedral voids in the unit cell is equal to
A metal crystallises into a lattice containing a sequence of layer as AB ABAB....... . What percentage of voids are left in the lattice?
Number of atoms in the unit cell of Na (bcc type crystal) and Mg (fcc type crystal) are, respectively
A face-centred cubic element (atomic mass 60) has a cell edge of 400 pm. What is its density?
Assuming the metal atom to be spherical and crystallizes in fcc lattice with edge length 407 pm, its radius will be
Xenon crystallises in the fcc lattice and the edge of the unit cell is 620 pm. The nearest neighbour distance of Xe is
The maximum proportion of available volume that can be filled by hard spheres in diamond is
The correct order of the packing efficiency in different types of unit cell is …A… Here, A refers to
In hcp arrangement, the number of nearest neighbours are
What is the coordination number of body centre cubic lattice?
Contribution of each atom per unit cell at face centre in a fcc unit cell is
Particles of quartz are packed by
In graphite, carbon atoms are joined together due to
Which of the following is a molecular crystal