19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Tetragonal crystal system has the following unit cell dimensions
In ccp arrangement the pattern of successive layers can be designated as
Solid CO₂ is an example of
Copper crystallises in face centred cubic lattice with a edge length of 361pm. What is the radius of copper atom in pm?
Which of the following is a pseudo solid
Which of the following is an example of metallic crystal solid
Assertion No compound has both Schottky and Frenkel defects. Reason Both defects change the density of the solid. [AIIMS 2008]
A solid A+B– has the B– ions arranged as below. If the A+ ions occupy half of the octahedral sites in the structure. The formula of solid is
Assertion : Covalent crystals have a higher melting point. Reason : Covalent bonds are stronger than ionic bonds.
Which of the following is non-crystalline 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
If the coordination number of Ca²⁺ in CaF₂ is 8, then the coordination number of F– ion would be
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
Aluminium has fcc structure. The length of the unit cell is 404 pm. If the density of the metal is 2.7 g cm–3, the molar mass of Al atom is
Doping of silicon (Si) with boron (B) leads to
Which of the following has the highest value of energy gap?
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
The interionic distance for caesium chloride crystal will be
Electrons in a paramagnetic compound are
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 compounds would be
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is
For an ionic crystal of the general formula AX and coordination number 6, the value of radius ratio will be
Which kind of defect is shown by the given crystal?