Advertisements
Advertisements
प्रश्न
A compound crystallizes in bcc structure. What is unit cell edge length if diameter of its atom is 120 pm?
उत्तर
Given: Type of unit cell is bcc.
Diameter of atom = 120 pm = 120 × 10-10 cm
To find: Unit cell edge length (a)
Formula: For bcc unit cell, r = `(sqrt3"a")/4`
Calculation: Radius of atom (r) = `"Diameter of atom"/2`
`= (120 xx 10^-10 "cm")/2`
= 60 × 10-10 cm
Using formula,
a = `(4"r")/sqrt3 = (4 xx 60 xx 10^-10 "cm")/1.732`
= 1.386 ×10-8 cm = 138.6 pm
Unit cell edge length is 138.6 pm.
APPEARS IN
संबंधित प्रश्न
The major binding force in diamond is_______________ .
(a) Covalent bond
(b) Ionic bond
(c) Metallic bond
(d) Co-ordinate covalent bond
What is the covalency of nitrogen in N2O5?
Give an example each of a molecular solid and an ionic solid.
Ionic solids conduct electricity in molten state but not in solid state. Explain
What type of solids are electrical conductors, malleable and ductile?
Explain The basis of similarities and differences between metallic and ionic crystals.
Explain Ionic solids are hard and brittle.
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.
Classify the following molecular solids into different types:
- HCl
- CO2
- Solid ice
- SO2
Answer the following in brief.
Distinguish between ionic solids and molecular solids
A compound is made up of two elements X and Y and crystallizes in bcc structure. Atoms of X are present at the corners of the cube. Atoms of Y are present at the centre of the cube. The formula of the compound is ______.
Graphite and diamond are ____________.
Solid CO2 is an example of ____________.
Differentiate crystalline solids and amorphous solids.
Classify the following solid.
NaCl
Classify the following solid.
Iodine
If NaCl is doped with 10−2 mol percentage of strontium chloride, what is the concentration of cation vacancy?
Select the INCORRECT match:
Which of the following is an example of molecular solid?
Which of the following is TRUE about molecular solids?
Dry ice is an example of ____________.
Fullerene is an example of ____________.
Which among the following is an example of network solid?
What type of interaction hold the molecules together in a polar molecular solid?
Ionization enthalpy is lowest in ____________.
Which among the following is an example of non-polar molecule?
Silicon carbide is an example of ____________.
London forces are present in ____________.
An AB2 type structure is found in ____________.
The compound, found in nature in gas phase but ionic in solid state is ____________.
Among solids, the highest melting point is exhibited by ____________.
Iodine molecules are held in the crystals lattice by ______.
NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying ____________.
Which of the following is not true about the ionic solids?
An excess of potassium ions makes KCl crystals appear violet or lilac in colour since:
(i) some of the anionic sites are occupied by an unpaired electron.
(ii) some of the anionic sites are occupied by a pair of electrons.
(iii) there are vacancies at some anionic sites.
(iv) F-centres are created which impart colour to the crystals.
Why are liquids and gases categorised as fluids?
Inspite of long range order in the arrangement of particles why are the crystals usually not perfect?
A crystal with a ≠ b ≠ c and α = β = γ = 90° is
Who introduced the term covalent bond?
The covalent bond length is the shortest in which one of the following bonds?
Among the following which is the best description of water in the solid phase?
Mention the res of the following solid:
CO2
Quartz is which type of crystal?
