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LILAVATIBAI PODAR SENIOR SECONDARY SCHOOL (ISC) CHEMISTRY - I PRELIMINARY EXAMINATION Std : XII Date : 06-01-20 Downloaded from TestPaperz.com Time : 3 hours Marks : 70 (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time) All questions are compulsory om Question 1 is of twenty marks having four sub parts all of which are compulsory Question numbers 2 to 8 carry 2 marks with any two questions having internal choice Question numbers 9 to 15 carry 3 marks with any two questions having internal choice Question numbers 16 to 18 carry 5 marks each with internal choice Gas constant R = 1.987 cal deg-1 mol-1 = 8.314 J K-1 mol-1 = 0.0821 L atm K-1 mol-1 1 Faraday = 96500 C PART 1 Answer all questions [4 x1] er z .c Question 1 (a) Fill in the blanks by choosing word / words from those given in the brackets pa p (orange , copper , less , more , isotropic , buta -1,3-diene , anisotropic , vinyl cyanide , pink , colourless , mercury , green , zinc , hexamethylene diamine , formaldehyde , styrene , phenol ) _______ can displace hydrogen from mineral acids as its standard reduction potential is ______ than zero (ii) Glass is ______ where as NaCl is ________ (iii) _______ and _____ are monomers of buna S (iv) SO2 gas turns acidified K2Cr2O7 from _______ to _______ (b) Complete the following by selecting the correct alternatives from the choices given (i) Propene on reacting with HBr gives A . A on reacting with Na and dry ether gives B. Identify A and B [4x 1] a. b. c. d. ht tp s: // te st (i) 2-bromopropane , 2,3-dimethyl butane Iso-propyl bromide , n-hexane sec-propyl bromide , n-butane n-propyl bromide , neo-pentane Downloaded from TestPaperz.com This paper consist of 6 printed sides Page 1 of 6
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