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Mastering Solid State (Chemistry-Class XII)
Somak Chatterjee|Mar 5th, 2013 10:18pm
Things to keep in mind:
- Do read the definitions given in the NCERT book for the terms Pseudo solids or Super cooled liquids, isotropic and anisotropic solids, molecular solids, Bravais lattice.
- For predicting formulae of compounds you need to revise the total number of atoms per unit cell For simple cubic unit cell it is 1, For bcc it is 2 and for fcc it is 4.
- Number of octahedral voids = Number of atoms and Number of tetrahedral voids = Twice the number of atoms
- For unit cell dimension the important formula is M= dNaa3/ z
- Imperfections in solids-
- Classification of solids based upon conductivities: Conductors, insulators and semi-conductors
- Classification of solids based upon magnetic properties: Paramagnetic, diamagnetic, ferromagnetic, anti-ferromagnetic and ferrimagnetic
Questions asked in previous years
| 2007 Set-1 Delhi
Q. What is the number of atoms per unit cell in a body-centred cubic structure? Q. Explain each of the following with a suitable example: (i) Paramagnetism(ii) Piezoelectric effect(iii) Frenkel defect in crystals Q. What is the coordination number of each type of ions in a rock-salt type crystal structure? 2008 Set-2 Delhi Q. What is the total number of atoms per unit cell in a face-centred cubic (fcc) structure? Q. What type of substances exhibits antiferromagnetism? Q.How would you account for the following? (i) Frenkel defects are not found in alkali metal halides.(ii) Schottky defects lower the density of related solids.(iii) Impurity doped silicon is a semiconductor. Q.Explain the following properties giving suitable examples: (i) Ferromagnetism(ii) Paramagnetism(iii) Ferrimagnetism 2009 Set-1 Delhi Q.Which point defect in crystals does not affect the density of the relevant solid? Q.Iron has a body-centred cubic unit cell with a cell edge of 286.65 pm. The density of iron is 7.87 g cm. Use this information to calculate Avogadro’s number. 2010 Set-3 Delhi Q.Which point defect in crystals of a solid decreases the density of the solid? Q.The density of copper metal is 8.95 g cm. If the radius of copper atom is 127.8 pm, is the copper unit cell a simple cubic, a body-centred cubic or a face centred cubic structure? (Given: At. Mass of Cu = 63.54 g mol and NA = 6.02 × 1023 mol) 2011 Set-1 Delhi Q.‘Crystalline solids are anisotropic in nature’. What does this statement mean? Q.Silver crystallizes in face-centred cubic unit cell. Each side of this unit cell has a length of 400 pm. Calculate the radius of the silver atom. (Assume the atoms just touch each other on the diagonal across the face of the unit cell. That is each face atom is touching the four corner atoms.) 2012 Set-1 Delhi Q. What is meant by doping in a semi-conductor? Q. Tungsten crystallizes in body centered cubic unit cell. If the edge of the unit cell is 316.5 pm, what is the radius of tungsten atom? |
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Add Comment Total Comments (8)
1. dynccrick | March 13th, 2013 at 10:22 am
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2. Adarsh | March 10th, 2013 at 6:41 pm
Thanks Sir…..
This was like a check list for me and I found in the pattern of numericals after 2009 Paper.
3. sarath | March 7th, 2013 at 5:21 pm
Thanks.Liked it. in Frenkel and schottky defects,it is ionic solids.
4. Swathi | March 6th, 2013 at 9:54 pm
Thank u 🙂 …….
5. wonders | March 6th, 2013 at 9:23 pm
thanku….
pls do post for other lessons too…(p-block)…….
our exams are near.. 🙂
6. bharti | March 6th, 2013 at 5:34 pm
thnkuu very much sir… 🙂
7. Thamanna Haya | March 6th, 2013 at 12:37 pm
Thx..
8. himanshu | March 5th, 2013 at 10:38 pm
thanx a lot to all experts for such great helps.
wish that you will always provide such helps.
keep it up meritnation.
🙂
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