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Explain Ionic Solids Are Hard and Brittle. - Chemistry

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प्रश्न

Explain Ionic solids are hard and brittle.

Ionic solids are hard and brittle. Explain

उत्तर १

The constituent particles of ionic crystals are ions. These ions are held together in three-dimensional arrangements by the electrostatic force of attraction. Since the electrostatic force of attraction is very strong, the charged ions are held in fixed positions. This is the reason why ionic crystals are hard and brittle.

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उत्तर २

Ionic solids are hard and brittle.Ionic solids are hard due to the presence of strong electrostatic forces of attraction. The brittleness in ionic crystals is due to the non- directional bonds in them.

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पाठ 1: The Solid State - Exercises [पृष्ठ ३१]

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एनसीईआरटी Chemistry [English] Class 12
पाठ 1 The Solid State
Exercises | Q 9.2 | पृष्ठ ३१

संबंधित प्रश्‍न

What is the covalency of nitrogen in N2O5?


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?


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.


An ionic compound crystallises in FCC type structure with ‘A’ ions at the centre of each face and ‘B’ ions occupying corners of the cube. The formula of compound is _______.


Distinguish between crystalline solids and amorsphous solids.


Classify the following molecular solids into different types: 

  1. HCl
  2. CO2
  3. Solid ice
  4. SO2

Account for the following : 

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


Answer the following in one or two sentences.

What are the types of particles in each of the four main classes of crystalline 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 ______.


Classify the following solid:

Pb


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


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Reason: for a monoclinic system, a ≠ b ≠ c and α = γ = 90°, β ≠ 90°


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Classify the following solid.

Brass


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____________ is an example of molecular crystal.


Dry ice is an example of ____________.


Fullerene is an example of ____________.


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


Which among the following is an example of network solid?


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Ionization enthalpy is lowest in ____________.


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Silicon carbide is an example of ____________.


London forces are present in ____________.


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An AB2 type structure is found in ____________.


Solid CH4 is ____________.


An example of a covalent crystalline solid 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 ____________.


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(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.


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(i) SiC (Silicon carbide)

(ii) AlN

(iii) Diamond

(iv) I2 


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Which of the following exists as covalent crystals in the solid state?


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The major binding force in diamond, silicon and quartz is ______.


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Which of the following is not correct?


Graphite is a ______.


Mention the res of the following solid:

CO2


Quartz is which type of crystal?


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