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Define unit cell. - Chemistry

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प्रश्न

Define unit cell.

परिभाषा
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उत्तर

A basic repeating structural unit of a crystalline solid is called a unit cell.

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अध्याय 6: Solid State - Evaluation [पृष्ठ २००]

संबंधित प्रश्न

The major binding force in diamond is_______________ .

(a) Covalent bond                                                  

(b)  Ionic bond

(c) Metallic bond                                                   

(d)  Co-ordinate covalent bond


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?


Explain the basis of similarities between metallic and ionic crystals.


Classify the following solids into different types:

a. Ammonium phosphate

b. Brass

c. S8 molecule

d. Diamond


Classify the following molecular solids into different types: 

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

Define Anisotropy.


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?


Answer the following in brief.

Distinguish between ionic solids and molecular solids


Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.


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 ____________.


Classify the following solid.

P4


Classify the following solid.

Brass


Classify the following solid.

Diamond


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?


____________ is an example of molecular crystal.


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?


Brass is an example of ____________.


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 ____________.


Which among the following is an example of non-polar molecule?


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:


An AB2 type structure is found in ____________.


Solid CH4 is ____________.


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


The major binding force of diamond, silicon and quartz is ____________.


Graphite cannot be classified as ______.


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?


Which of the following cannot be regarded as molecular solid?

(i) SiC (Silicon carbide)

(ii) AlN

(iii) Diamond

(iv) I2 


Inspite of long range order in the arrangement of particles why are the crystals usually not perfect?


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?


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 ______.


Among the following which is the best description of water in the solid phase?


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


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