मराठी
महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Define unit cell.

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प्रश्न

Define unit cell.

व्याख्या
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उत्तर

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

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पाठ 6: Solid State - Evaluation [पृष्ठ २००]

संबंधित प्रश्‍न

What is the covalency of nitrogen in N2O5?


Give an example each of a molecular solid and an ionic solid.


Explain the basis of similarities between metallic and ionic crystals.


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 _______.


Classify the following molecular solids into different types: 

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

How are the crystalline solids classified?


Answer the following in brief.

Distinguish between ionic solids and molecular solids


Graphite and diamond are ____________.


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


Solid CO2 is an example of ____________.


In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F− Ion are ____________.


Give any three characteristics of ionic crystals.


Classify the following solid.

Brass


____________ is an example of molecular crystal.


Dry ice is an example of ____________.


Which among the following is not true for crystalline solid?


What type of interaction hold the molecules together in a polar molecular solid?


Ionization enthalpy is lowest in ____________.


London forces are present in ____________.


The hardest substance among the following is:


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 ______.


Which of the following is not true about the ionic solids?


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.


A crystal with a ≠ b ≠ c and α = β = γ = 90° is


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?


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 ______.


Which of the following is not correct?


What are intermolecular forces of attraction involved in molecular crystals?


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