Chemistry questions class 12

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Here I am giving you information about the Solid State Important Questions 02 for class 12 Chemistry in a PDF file with it so you can get it easily..

Some content of PDF is given below :

SHORT ANSWER QUESTION (2)
Q1. What do you mean by paramagnetic substance?
Ans: ‐ Attracted by pragnetic field and these substances are made of atoms or ions with unpaired
electrons.
Q2. Which substance exhibit schottky and Frenkel both defects.
Ans: ‐ AgBr
Q3. Name a salt which is added to Agcl so as to produce cation vacancies.
Ans:‐Cdcl2
Q4. Why Frenkel defects not found in pure Alkali metal halide.
Ans: ‐ Due to larger size of Alkali metal ion.
Q5. What is the use of amorphous silica?
Ans. Used in Photovoltaic cell.
Q6. Analysis shows that a metal oxide has the empirical formula Mo.9801.00. Calculate the
percentage of M2+ and M3+ ions in the crystal.
Ans: ‐ Let the M2+ ion in the crystal be x and M3+ =0.98‐x
Since total change on the compound must be zero
2x+3(0.098‐x)‐z=0
X=0.88
%of M2+ 0.88/0.96*100=91.67
% of M3+ =100‐91.91.67=8.33
Q7. What is the co‐ordination no. of cation in Antifluorite structure?
Ans: ‐ 4
Q8. What is the Co.No. of cation and anion in Caesium Chloride.
Ans: 8 and 8
Q9. What is F centre?
Ans:‐ It is the anion vacancy which contains unpaired electron in non‐stoichiometric compound
containing excess of metal ion.
Q10. What makes Alkali metal halides sometimes coloured, which are otherwise colourless?
Very Short Answers(1 marks) :
1. How does amorphous silica differ from quartz?
In amorphous silica, SiO4 tetrahedral are randomly joined to each other whereas in quartz they are
linked in a regular manner.
2. Which point defect lowers the density of a crystal?
Schottky defect.
3. Why glass is called supper cooled liquids?
It has tendency to flow like liquid.
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