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?
Assertion No compound has both Schottky and Frenkel defects. Reason Both defects change the density of the solid. [AIIMS 2008]
Identify the incorrect statement.
On the basis of their magnetic properties, substances can be classified into …A… categories. Here, A refers to
Those substances which show permanent magnetism even in the absence of magnetic field are called
Electrons in a paramagnetic compound are
Doping of silicon (Si) with boron (B) leads to
Amorphous solids are
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are [NEET 2021]
Which type of defect present in NaCl ? (JIPMER 2019)
The number of tetrahedral and octahedral voids in a CCP array of 100 atoms are respectively (Kerala CEE 2014)
Which of the following does not show electrical conduction in its physical state ? (CBSE AIPMT 2013)
Schottky defect in crystals is observed when (RPMT 2010)
The property of crystalline solid is not (OJEE 2010)
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,
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
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