Advertisements
Advertisements
प्रश्न
Distinguish between crystalline solids and amorsphous solids.
Advertisements
उत्तर
| Points | Crystalline solids | Amorphous solids |
| Arrangement | The constituents particles are arranged in regular order. | The constituents particles show disordered arrangement. |
| Order | Exhibit both long-range and short-range order. | Exhibit only short-range order. |
| Melting point | They have a sharp melting point. | They melt over a range of temperatures. |
| Heat of fusion | Show definite heat of fusion. | Do not have definite heat of fusion. |
| Clearage property | They undergo a clean clearage. | They cut irregularly. |
| Physical property | Show anisotropy in physical property measurements. | They are isotropic. |
| Nature | They are true solids. | They are pseudo solid or supercooled liquid. |
APPEARS IN
संबंधित प्रश्न
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?
Explain the basis of similarities between metallic and ionic crystals.
Explain ionic solids are hard and brittle.
Classify the following molecular solids into different types:
- HCl
- CO2
- Solid ice
- SO2
Account for the following :
o-nitrophenol is more steam volatile than p-nitrophenol.
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 ______.
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
Classify the following solid:
Pb
Solid CO2 is an example of ____________.
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°
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 ______.
Define unit cell.
Give any three characteristics of ionic crystals.
Classify the following solid.
Diamond
Classify the following solid.
NaCl
Which of the following is TRUE about molecular solids?
Dry ice is an example of ____________.
Which among the following is not true for crystalline solid?
Order of increasing melting points among H2O(s), C(s), CS2 and Sn is ____________.
What type of interaction hold the molecules together in a polar molecular solid?
Which among the following is an example of non-polar molecule?
Silicon carbide is an example of ____________.
Solid CH4 is ____________.
Among solids, the highest melting point is exhibited by ____________.
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?
Which of the following is not the characteristic of ionic solids?
Graphite cannot be classified as ______.
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?
A crystal with a ≠ b ≠ c and α = β = γ = 90° is
The covalent bond length is the shortest in which one of the following bonds?
Calculate the angle at which first order reflection will occurs in an X-ray spectrometer when x ~ rays of wavelength \[\ce{1.54 \overset{\circ}{A}}\] are diffracted by the atoms of a crystal given that inter planer distance is \[\ce{0.04 \overset{\circ}{A}}\]
A reddish-pink substance on heating gives off a vapour which condenses on the sides of the test tube and the substance turns blue. If on cooling water is added to the residue it turns to original colour. The substance is ______.
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?
Quartz is which type of crystal?
