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Type of Announcement : 12 Th board Mock test for Chemistry
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Mock test for Chemistry

Tamil Nadu Pre-board Class XII
General Instructions:
(i) Answer all the questions from Part-I.
(ii) Answer any fifteen questions from Part-II. Answer in one or two sentences.
(iii) Answer any seven questions from Part-III. Atleast one question from each section of Part-III should be attempted.
(iv) Answer question number 70 and any three questions from the remaining questions in Part- IV.
(v) Draw diagrams and write equations wherever necessary

Part - I
Note: Answer all the questions

Choose and write the correct answer :
1. Intermolecular hydrogen bonding is present in ______.
(a) o-nitrophenol
(b) Salicylic acid
(c) Salicylaldehyde
(d) Hydrogen fluoride
2. Ionization energies of Beryllium and Boron are related as ______.
(a) Be>B
(b) Be<B
(c) Be=B
(d) Be<=B
3. The structure of IF7 is ______.
(a) Pentagonal
(b) Pentagonal pyramidal
(c) Pentagonal bipyramidal
(d) Octagonal
4. On adding an alkali to a solution of dichromate it is converted into ______.
(a) Potassium hydroxide
(b) Potassium permanganate
(c) Chromyl chloride
(d) Potassium chromate
5. The most common oxidation state of Actinides is ______.
(a) +4
(b) +2
(c) +3
(d) 0
6. Paramagnetic moment is expressed in ______.
(a) Debye unit
(b) K.Joules
(c) BM
(d) ergs
7. The 8:8 type of packing is present in
(a) MgF2
(b) CsCl
(c) KCl
(d) NaCl
8. ______ deviates from Trouton’s rule.
(a) Alcohol
(b) Liquid Helium
(c) Acetic acid
(d) Water
9. Isomerization of cyclopropane to propene is an example of ______.
(a) Parallel reaction
(b) Simple reaction
(c) Opposing reaction
(d) Consecutive reaction
10. Cottrell’s precipitator is used to precipitate ______.
(a) Silver chloride
(b) Clay contaminated water
(c) Smoke
(d) Emulsion

Part - II
Note: (i) Answer any Fifteen questions.
(ii) Answer in one or two sentences

11. What is bond order? Explain.
12. Why the I.E. of carbon (At no. 6) is more than that of boron (At no. 5)? Give reason.
13. What is the action of P2O3 with (i) cold water and (ii) hot water? Write balanced chemical equation for these reactions?
14. What is the action of Xenon fluorides (XeF2 and XeF6) with water?
15. Why transition elements form coloured ions?
16. What is lunar caustic? Write about its preparation.
17. Write about energy released in nuclear fission reaction.
18. What are metallic crystals?
19. Write about the units of entropy.
20. What is threshold energy?

Part -III
Note: (i) Answer any seven questions.
(ii) Atleast one questions from each section should be attempted
Section - A
21. Calculate the uncertainty in the velocity of a wagon of mass 3000 kg whose position is known to an accuracy of ?10 pm (Planck’s constant = 6.626 ? 10?34 kgm2S?1 )
22. How is gold extracted by Mac Arthur Forrest cyanide process?
23. Describe the extraction of lanthanides from monazite sand.
24. (i) What are ambidentate ligands? Why are they called so?
(ii) What are the uses of coordination compounds in bio-inorganic chemistry
Section - B
25. In a first –order reaction, it takes the reactant 40.5 minutes to be 25% decomposed. Find the rate constant of the reaction.
26. State Trouton’s rule, mention its applications and give examples of substances that deviates from Trouton’s rule.
27. Apply Le Chatelier’s principle to Haber’s process of manufacture of ammonia.
28. Write notes on IUPAC convention of representation of a cell
Section - C
29. Explain about the following reactions
(i) Halogenation in ethers.
(ii) Formation of peroxides in ethers.
(iii) Formation of oxonium salts in ethers.
30. Explain the mechanism of acid catalysed dehydration of ethanol at high
temperature?
31. Write briefly on antibiotics? In what way antipasmodics are helpful?

Part - IV
Note: Answer Question Number 70 and any three from the remaining questions

32. (a) Explain the various factors that affect electron affinity. Explain with some examples.
(b) What are the ores of lead? How is lead extracted from its ore?
33. (a) What are the postulates of valence bond theory?
(b) Bring out the differences between nuclear and chemical reactions

See more question Download here : upes.ac.in/pdf/TN_XII_Chemistry_QuestionPaper.pdf
If you want answer key for Chemistry paper click here : upes.ac.in/pdf/TN_XII_Chemistry_Solution.pdf