19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The formula for determination of density of unit cell is (a) a N g cm N M A x x (b) M g cm a N A Z x x (c) a M g cm N N A x x (d) M N g cm a N A x x
A compound is formed by elements A and B. This crystallizes in the cubic structure when atoms A are the corners of the cube and atoms B are at the centre of the body. The simplest formula of the compound is
Tetragonal crystal system has the following unit cell dimensions
Crystals can be classified into basic crystal habits equal to
The number of atoms contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is
The property of crystalline solid is not
If the number of atoms per unit cell in a crystal is 2, the structure of crystal is
An alloy of Cu, Ag and Au is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centre and gold is present at body centre, the alloy has a formula
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is
For tetrahedral coordination the radius ratio r r should be
Assertion : Covalent crystals have a higher melting point. Reason : Covalent bonds are stronger than ionic bonds.
Assertion No compound has both Schottky and Frenkel defects. Reason Both defects change the density of the solid. [AIIMS 2008]
Which of the following is non-crystalline solid
Those substances which show permanent magnetism even in the absence of magnetic field are called
On the basis of their magnetic properties, substances can be classified into …A… categories. Here, A refers to
Electrons in a paramagnetic compound are
Which of the following is a pseudo solid
Which of the following has the highest value of energy gap?
Doping of silicon (Si) with boron (B) leads to
Identify the incorrect statement.
Solid CO₂ is an example of
Which of the following is an example of metallic crystal solid
Given, Column A Column B A. Ionic solid I. NaCl B. Metallic solid II. Fe C. Covalent solid III. C(graphite) D. Molecular solid IV. Dry ice
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is
The number of tetrahedral voids in the unit cell of a face centred cubic lattice of similar atoms is