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CBSE XII Pre Boards 2015 : CHEMISTRY with Answers (KV Chennai)

9 pages, 51 questions, 35 questions with responses, 56 total responses,    0    0
Kendriya Vidyalaya Air Force Stn Sulur
Kendriya Vidyalaya Air Force...,  Sulur, Coimbatore 
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KENDRIYA VIDYALAYA SANGATHAN CHENNAI REGION COMMON PRE-BOARD EXAMINATION 2014-15 CHEMISTRY CLASS-XII TIME:3HRS MAX.MARKS-70 Instructions: Answer all the questions. Questions 1 to 5are very short answer type and carry one mark each. Answer them in one word or in one sentence. Questions 6 to 10 are short answer type and carry 2 marks each. Answer them in 20 words. Questions 11 to 22 are short answer type and carry 3 marks each. Answer them in 30 words. Question 23 is value based question and carry 4 marks. Questions 24 to 26 are long answer type and carry 5 marks each. Answer them in 50 to 60 words. All 5 mark questions, one 3 mark question and one 2 mark question have internal choice. There is no overall choice. Use log book wherever needed. Use of calculator or any other electronic item is strictly prohibited. 1. 2. 3. 4. Write the IUPAC name of p-Cl C6H5CHO. (1) What are Nucleosides? (1) Ethers are highly volatile than alcohols. Give reason. (1) Why are the diazonium salt formed by aliphatic amines unstable whereas that of aromatic amines stable. (1) 5. What is the basic principle involved in zone refining method of purification of metals. (1) 6. In the Button cell, widely used in watches, the following reaction takes place: Zn(s) +Ag2O(s) + H2O Z +2(aq) + 2Ag(s)+ 2OH-(aq) CalculateE0cell and standard Gibbs energy for the reaction. (Given: E0Ag+ / Ag = + 0.80 V ; E0Zn+ / Zn = - 0.76 V )(2) OR What is meant by over voltage and electro chemical equivalent in electro chemistry? 7. Haloarenes are less reactive than haloalkanes towards nucleophilic substitution reactions. Give two reasons. (2) 8. Distinguish between(2) a. Pentan-3-one and Pentan-2-one. b. Ethanal and propanol.

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