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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

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


Explain the basis of similarities between metallic and ionic crystals.


Define Anisotropy.


Account for the following : 

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


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 ______.


Solid CO2 is an example of ____________.


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 ______.


Classify the following solid.

Diamond


Classify the following solid.

Iodine


Which of the following is an example of molecular solid?


____________ is an example of molecular crystal.


Which among the following is NOT a polar molecular solid?


Nature of binding forces present in carbon dioxide molecules in solid state are ____________.


Ionization enthalpy is lowest in ____________.


Silicon carbide is an example of ____________.


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


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


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


In graphite electrons are ____________.


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 ____________.


How many chloride ions are surrounding sodium ions in sodium chloride crystal?


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


Who introduced the term covalent bond?


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


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


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


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


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


Mention the res of the following solid:

Ice


What are intermolecular forces of attraction involved in molecular crystals?


Quartz is which type of crystal?


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