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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Distinguish Between Crystalline Solids and Amorsphous Solids.

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प्रश्न

Distinguish between crystalline solids and amorsphous solids.

फरक स्पष्ट करा
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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.
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2018-2019 (March) Set 1

संबंधित प्रश्‍न

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.


Account for the following : 

o-nitrophenol is more steam volatile than p-nitrophenol.  


How are the crystalline solids classified?


Answer the following in one or two sentences.

A solid is hard, brittle and electrically nonconductor. Its melt conducts electricity. What type of solid is it?


A compound crystallizes in bcc structure. What is unit cell edge length if diameter of its atom is 120 pm?


Give any three characteristics of ionic crystals.


Select the INCORRECT match:


Which of the following is TRUE about molecular solids?


Which among the following is NOT a polar molecular solid?


Lithium crystallizes into body centered cubic structure. What is the radius of lithium if edge length of it's unit cell is 351 pm?


Solid X is a very hard electrical insulator in solid as well as in molten state. It melts at extremely high temperature. Solid X is a ____________.


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?


Ionization enthalpy is lowest in ____________.


Silicon carbide is an example of ____________.


London forces are present in ____________.


MgO has the structure of NaCl. The coordination number of the ions in MgO is ____________.


The hardest substance among the following is:


Solid CH4 is ____________.


Among solids, the highest melting point is exhibited by ____________.


Which one of the following forms a molecular solid when solidified?


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?


Who introduced the term covalent bond?


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 \[\ce{0.04 \overset{\circ}{A}}\]


Which of the following molecules is non-polar in nature?


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