Prepare for AISSCE (CBSE Class XII) Chemistry through selected Long ANswer Type Questions – Unit 1 – The Solid State

Chapterwise long answer type questions for AISSCE (CBSE Class XII) Chemistry

Unit 1 – The Solid State

English: The face centered cubic crystal struc...

  1. Describe the following
    1. Hexagonal close packing
    2. Cubic close packing
    3. Body centred cubic packing
  2. What are the seven types of crystal systems? Give their unit cell dimensions. Draw structures of different types of unit cells which are possible for cubic crystal system.
  3. What do you mean by stoichiometric point defects? Describe briefly the various types of stoichiometric point defects.
  4. Explain the following.
    1. Schottky defect
    2. Frenkel defect
    3. F – centres
  5. Explain the conduction behaviour of metals, semiconductors and insulators on the basis of band theory of solids. What is the effect of increase of temperature on electrical conductivity of metals, semiconductors and insulators.
  6. Explain the following with suitable examples
    1. Paramagnetic substances
    2. ferrimagnetic substances
    3. Ferromagnetic substances



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Be the first to comment - What do you think?  Posted by admin - February 12, 2014 at 5:51 pm

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Do you find it difficult to pass in Chemistry? Here are some tips to PASS!

Some students find it difficult to get pass marks in Chemistry. For them, here are some tips to get pass marks.

Chemistry generally contains three parts – inorganic, organic and physical. Most of the students find the organic part difficult to understand. It’s natural. It’s difficult to keep in mind all the formulas and equations of organic chemistry. But it’s just almost one third of the portion.

You can get more than 60% of marks by concentrating on Physical and inorganic portion.

SO, here’s a plan for those who want to pass marks in the available time.

Concentrate on Physical and inorganic part of chemistry without leaning any portion untouched. After you are confident about that, try to find out all named reactions, laws and principles.

A simple principle to follow is, learn thoroughly what you already know, then go to assimilate what you know partially.

If there are some portions you are not able to crack at all, you can leave it safely (unless it amounts to a major share)

Avoid learning new things, difficult  to understand portions in the last minute, but revise those portions which you have learnt already.

A cool mind is more productive.

Answer all questions.

This is a simple trick. If it happens by chance that some question has some error, then those attempted it will be benefitted.

Further, if you attempt the questions with an intention to score, some relevant points will also come into your answer and you may get some marks – say 1/2 or 1. These marks will add up to give you a pass marks.

So, attempt all questions with an intention to get maximum marks.

Lean all diagrams and draw them perfectly.

Be the first to comment - What do you think?  Posted by admin - February 7, 2014 at 6:09 am

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Memorise Periodic Table using Mnemonics

Group 1>H(Hydrogen)ele(Lithium)n(Sodium) K(Potassium)abr(Rubidium) Se(Cesium)faraar(Francium)
= Helen kabr se faraar
Group 2>Be(Beryllium)ta mange(Magnesium) Car(Calcium) scooter(Strontium) Baap(Barium)Roye(Rubidium)
=Beta maange car scooter , baap roye
Group 13>B(Boron)al(Aluminium) Ga(Gallium)ngadhar In(Indium)dian Ti(Thallium)lak
==Bal Gangadhar Indian Tilak

Group 14>C(Carbon)ollege student(Silicon) ge(Germanium)t some(Sn=Tin) prob(Pb=Lead)lem
==College student get some problem
Group 15>N(Nitrogen)ews p(Phosphorus)aper Aaj (Arsenic) sab(Sb=Antimony) bi(Bismuth)kega
===News paper aaj sab bikega
Group 16>O(Oxygen)s(Suplhur) se(Selenium) te(Tellurium)po(Polonium) ( Os = Uss , Tepo is a word meaning to press)
===Os se tepo
Group 17>F(Flourine)ir Kal(Chlorine) bahar(Bromium) aayi(I = Iodine)
====Fir kal bahar aayi
Group 18>Hai (Helium) Na(Neon)na Aaj(Argon)  Ka (Krypton)  Zinda(Xenon)  Raja(Radium)
====Hai Nana aaj ka Zinda raja

The Hydrogen group

Hi Lila Ne Kiya Rab se fariyaad

Hydrogen(H), Lithium(Li), Sodium(Na), Pottassium(K), Rubidium(Rb), Cesium(Cs), Francium(Fr)


Be the first to comment - What do you think?  Posted by admin - February 26, 2013 at 12:07 pm

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Learn the Periodic Table of elements – song

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A Rap Music on Periodic Table

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