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

The major binding force in diamond is_______________ .

(a) Covalent bond                                                  

(b)  Ionic bond

(c) Metallic bond                                                   

(d)  Co-ordinate covalent bond


Explain ionic solids are hard and brittle.


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 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

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 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


Give any three characteristics of ionic crystals.


Classify the following solid.

Brass


Classify the following solid.

NaCl


If NaCl is doped with 10−2 mol percentage of strontium chloride, what is the concentration of cation vacancy?


____________ 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?


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


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


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


Silicon carbide is an example of ____________.


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


Solid CH4 is ____________.


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


Which of the following is not the characteristic of ionic solids?


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 ____________.


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


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.


Why are liquids and gases categorised as fluids?


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


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


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 is not correct?


Mention the res of the following solid:

Ice


Mention the res of the following solid:

CO2


What are intermolecular forces of attraction involved in molecular crystals?


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