19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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?
A metal crystallises into a lattice containing a sequence of layer as AB ABAB....... . What percentage of voids are left in the lattice?
Assuming the metal atom to be spherical and crystallizes in fcc lattice with edge length 407 pm, its radius will be
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
Packing efficiency of simple cubic lattice 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
The number of atoms or molecules contained in one body centered cubic unit cell is
Bravais lattices are of
A particular solid is very hard and has a high melting point. In solid state, it is a non-conductor and its melt is a conductor of electricity. Classify the solid.
Which one of the following is a molecular crystal?
Glass is
Which one of the following forms a molecular solid when solidified?
NaCl is an example of
Which of the following is an example of ionic crystal solid
Diamond is an example of
Which of the following is an example of covalent crystal solid
Particles of quartz are packed by
In graphite, carbon atoms are joined together due to
Which of the following is a molecular crystal
Among solids the highest melting point is established by
Mostly crystals show good cleavage because their atoms, ions or molecules are