Solid State
Tests knowledge of crystal lattices, unit cells, crystal structures, coordination numbers, defects, and semiconductor properties in solid state chemistry
Questions
What is the structure of a crystal, If the number of atoms per unit in a crystal is 2?
- Simple cubic
- Body centred cubic (bcc)
- Octahedral
- Face centred cubic (fcc)
- Hexagonal
A cubic lattice of intermetallic compound LiAg has both Li and Ag ions and coordination number = 8. The crystal class is of the lattice
- simple cubic
- body centred cube
- face centered cube
- octahedral
- hexagonal
Which of the following molecular crystals shows electrical conductivity?
- Diamond
- Silica
- Silver
- Graphite
- Wood
AB2 type structure is possible in
- N2O
- NaCl
- Al2O3
- CaF2
- Both in option 1 and 2
What is the coordination number of magnesium in MgO, which has the similar structure like NaCl?
- 2
- 4
- 6
- 8
- 12
KF has NaCl type structure. What is the distance between K+ and F- ions, if the cell edge is 'x' cm?
- x/2 cm
- x/4 cm
- 2x cm
- 4x cm
- 8x cm
A crystalline structure shows good cleavage when their atoms, ions or molecules are
- weakly bonded together
- strongly bonded together
- spherically symmetrical
- arranged in planes
- Both option 1 and 2
Doping of silicon with boron leads to
- n - type semiconductor
- p - type semiconductor
- metal
- insulator
- a non-metal
A crystal compound of a cubic structure is made up of two elements ‘A’ and ‘B', such that atoms ‘A’ are at the corners and atoms ‘B’ are at the center of the lattice. The formula of the compound is _______ .
- AB
- AB2
- A2B
- AB4
- ABO
Which of the following is/are non-stoichiometric compound?
- PbO
- NiO2
- Al2O3
- Fe3O4
- Options 2 and 3
Which of the following is/are responsible for Frenkel defect?
- The shift of a positive ion from its normal lattice site to an interstitial site
- An ion missing from the normal lattice site creating a vacancy
- An extra positive ion occupying an interstitial position in the lattice
- An extra negative ion occupying an interstitial position in the lattice
- Both (3) and (4)
How many number of atoms are present in the unit cell of bcc and fcc type crystals?
- 2 and 4 respectively
- 4 and 2 respectively
- 9 and 14 respectively
- 14 and 9 respectively
- Both unit cell have 4 atoms
In a laboratory, NaCl is made by burning Na in the atmosphere of Cl, which is yellow in colour. The yellow colour is due to the presence of
- electrons in the crystal lattice
- Na+ ions in the crystal lattice
- Cl- ions in the crystal lattice
- face-centred cubic crystal lattice
- gold in the crystal lattice
Due to the Frenkel defect, the density of ionic solids
- increases
- decreases
- remains the same
- either decrease or increase
- None of these
The total volume of atoms present in a face-centred cubic cell of a metal is (r is atomic radius)
- 20/3 πr3
- 12/3 πr3
- 16/3 πr3
- 24/3 πr3
- 26/3 πr3