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Class 12 ISC Prelims 2017 : Chemistry (Salt Lake School, Kolkata)

4 pages, 60 questions, 41 questions with responses, 52 total responses
Saptarshi Biswas
Salt Lake School, Kolkata
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SALT LAKE SCHOOL (English Medium) Selection Test- 2014-15 (Class- XII) CHEMISTRY Time- (15 mins reading time + 3hrs writing time) F.M-70 SECTION - I (Attempt all questions) 1.a)FiIl in the blanks with words from those given in brakets:[heterolytic, molesr-si] CH3CH2NC,homolytic, CH3CH2CN, night-blindness, beri-beri, scurvy, 1st, 2nd, 3rd, (molesl-ijis-i, S-l, i) The unit of the rate constant of a 1st order reaction is and that of a 2nd order reaction is _ ii) Br2 undergoes cleavage in presence of H202 but cleavage in presence of H20. iii) The reaction of CH3CH2Cl+ OH- -----------7 Cl-hCHzOH is a order reaction whereas the reaction (CH3)3CCl + OH- ----------7 (CH3)3COHis a order reaction. iv) KCN gives with CH3CH2Clwhere as AgCN gives _ v) Vitamin C deficiency causes and vitamin A deficiency causes _ b)Match i) [Cu(NH3)4)2+ 0) CIF3 iii) BH3 iv)[NiC14)2v) [FeF6P- a) sp-' b) tetrahedral c) dspd) octahedral e) sp-d c) Choose the correct option from the following:i) The coordination no of Na+ ion in an unit cell of NaCI is: a) 4 b) 6 c) 8 d) 12 ii) In acidic medium, 1 mole of Mn04 - accepts how many moles of electron in a redox process? a) 1 b) 3 c) 5 d) 6 iii) Which of the following gives yellow oily liquid with nitrous acid: a) Methyl amine b) Aniline c) Dimethyl amine d) Trimethylamine iv) The most acidic among them is: a) Benzoic acid b) o-hydroxy benzoic acid c)m-hydroxy benzoic acid d) p-hydroxy benzoic acid v) The most stable ion among them is: c.) b) C.H = l C"I--l- + 0-12. + do) c. ~~_) - ~ - C:. \-) J c~..1 d) Explain :i) CH3CH2CIgives CH3CH2N02with AgN02 but with KNOz gives CH3CH20NO. ii) Zn2+precipitates out at Gr IV where as Cu> precipitates out at Gr II. iii) Ethylebenzene cannot be prepared by the alkylation of Benzene. iv) Diamond is hard but Graphite is soft. v) The size of atomic radii of Zr and Hf are almost equal: /' , " (5X4)

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