Solid States
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8. Why does table salt, NaCl, sometimes appear yellow in colour?
8. Why does table salt, NaCl, sometimes appear yellow in colour?
8. Yellow colour in NaCl is due to the defect called as metal excess defect. In this defect anionic vacancies get created due to the diffusion of Cl-ions to the surface of the crystal and there after unpaired electrons occupy anionic sites. These sites are known as F-centres. The electrons at F
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7. Inspite of long-range order in the arrangement of particles why are the crystals usually not perfect?
7. Inspite of long-range order in the arrangement of particles why are the crystals usually not perfect?
7. Crystals have long range ordered arrangement of their constituent particles but usually these crystals are not perfect as during the process of crystallisation some deviations as compared to such ideal arrangement set in depending upon the rate of cooling or presence of impurities in s
Upvote 6. In solids the constituent particles are found to possess fixed positions and can only oscillate about their mean positions and hence they are said to be incompressible and rigid.
Upvote 5. The liquids and gases both are categorised as fluids as they show the ability to flow and also their molecules can move past one another freely.
Upvote 4. A sample of ferrous oxide has the actual formula Fe0.93 O1.00. In this sample, what fraction of metal ions are Fe2+ ions? What type of non stoichiometric defect is present in this sample?
4. A sample of ferrous oxide has the actual formula Fe0.93 O1.00. In this sample, what fraction of metal ions are Fe2+ ions? What type of non stoichiometric defect is present in this sample?
4. Let the formula of sample be (Fe2+)x (Fe3+) yO
From the formula of the compound the equation can be formed as-
x+ y= 0.93 . (i)
Total positive charge on ferrous and ferric ions should balance the two units of negative charge on oxygen. Hence,
2x+ 3y= 2 . (ii)
⇒ x+ y=1.
Upvote 3. How does doping increase the conductivity of semiconductors?
3. How does doping increase the conductivity of semiconductors?
3. The conductivity of a semiconductor is very low and it can be increased by adding small impurities and this process is known as doping.
Doping can be done with an impurity which is electron rich or electron deficient-
n-type semiconductors- Si or Ge (group-14 elements) are doped wi
Upvote 2. Show that in a cubic close packed structure, eight tetrahedral voids are present per unit cell.
2. Show that in a cubic close packed structure, eight tetrahedral voids are present per unit cell.
2. A ccp structure unit cell is divided into 8 small cubes. Each small cube has atoms at alternate corners as shown in the figure. In all, each small cube has 4 atoms. When these are joined to one another, they make a regular tetrahedron. Thus, there is one tetrahedral void in each small cube a
Upvote 1. With the help of a labelled diagram show that there are four octahedral voids per unit cell in a cubic close packed structure.
1. With the help of a labelled diagram show that there are four octahedral voids per unit cell in a cubic close packed structure.
1. When any atom is surrounded by six atoms it creates an octahedral void. In fcc, body centre is surrounded by six atoms present at the face centre. And hence one octahedral void is present at the body centre of each unit cell.
No. of octahedral void at the centre of 12 edge = 12 * = 3
N
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