Advertisements
Advertisements
प्रश्न
Define unit cell.
Advertisements
उत्तर
A basic repeating structural unit of a crystalline solid is called a unit cell.
APPEARS IN
संबंधित प्रश्न
What is the covalency of nitrogen in N2O5?
Give an example each of a molecular solid and an ionic solid.
Solid A is a very hard electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?
Ionic solids conduct electricity in molten state but not in solid state. Explain
What type of solids are electrical conductors, malleable and ductile?
Copper crystallises into a fcc lattice with edge length 3.61 × 10−8 cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm−3.
Classify the following solids into different types:
a. Ammonium phosphate
b. Brass
c. S8 molecule
d. Diamond
Distinguish between crystalline solids and amorsphous solids.
Account for the following :
o-nitrophenol is more steam volatile than p-nitrophenol.
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
A compound crystallizes in bcc structure. What is unit cell edge length if diameter of its atom is 120 pm?
Graphite and diamond are ____________.
An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube. the correct formula of AxBy is
Assertion: monoclinic sulphur is an example of a monoclinic crystal system
Reason: for a monoclinic system, a ≠ b ≠ c and α = γ = 90°, β ≠ 90°
In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F− Ion are ____________.
The ionic radii of A+ and B− are 0.98 × 10−10 m and 1.81 × 10−10 m. The coordination number of each ion in AB is ______.
Classify the following solid.
Brass
Which among the following is not true for crystalline solid?
Brass is an example of ____________.
Nature of binding forces present in carbon dioxide molecules in solid state are ____________.
What type of interaction hold the molecules together in a polar molecular solid?
London forces are present in ____________.
The hardest substance among the following is:
An AB2 type structure is found in ____________.
Which of the following exists as covalent crystals in the solid state?
The major binding force of diamond, silicon and quartz is ____________.
In graphite electrons are ____________.
Which of the following is a network solid?
How many chloride ions are surrounding sodium ions in sodium chloride crystal?
Why are liquids and gases categorised as fluids?
The covalent bond length is the shortest in which one of the following bonds?
Which of the following is not correct?
Graphite is a ______.
Mention the res of the following solid:
Ice
Mention the res of the following solid:
CO2
What are intermolecular forces of attraction involved in molecular crystals?
