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Class 12 Maharashtra HSC 12th 2013 : Chemistry

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Target Publications Pvt. Ltd. Chemistry board question paper: march 2013 Chemistry Time: 3 Hours Total Marks: 70 Note: i. All questions are compulsory. ii. Answer to the two sections are to be written in the same answer book. iii. Figure to the right hand side indicate full marks. iv. Write balanced chemical equations and draw neat and labelled diagrams wherever necessary. v. Every new question must be started on a new page. vi. Use of logarithmic table is allowed SECTION I Q.1. Select and write the most appropriate answer from the given alternatives for each sub-question: i. In body centred cubic structure, the space occupied is about _______. (B) 53 % (A) 68 % (C) 38 % (D) 32 % ii. For a gaseous reaction, the unit of rate of reaction is _______. (B) atm mol 1 s 1 (A) L atm s 1 1 (C) atm s (D) mol s iii. Which of the following compounds contains S = O as well as S = S bonds? (A) Sulphuric acid (B) Thiosulphuric acid (C) Sulphurous acid (D) Thiosulphurous acid iv. Which of the following solutions shows maximum depression in freezing point? (A) 0.5 M Li2SO4 (B) 1 M NaCl (C) 0.5 M Al2(SO4)3 (D) 0.5 M BaCl2 v. For a chemical reaction, S = 0.035 kJ/K and H = 20 kJ. At what temperature does the reaction turn non-spontaneous? (A) 5.14 K (B) 57.14 K (C) 571.4 K (D) 5714.0 K vi. The standard e.m.f of the following cell is 0.463 V Cu | Cu++(1 M) || Ag+(1M) | Ag. If E oAg = 0.800 V, What is the standard potential of Cu electrode? (A) 1.137 V (B) (C) 0.463 V (D) vii. [7] 0.337 V 0.463 V Fe2O3 is reduced to spongy iron near the top of blast furnace by _______. (A) H2 (B) CaO (C) SiO2 (D) CO Q. 2. Answer any SIX of the following: i. Distinguish between crystalline solid and amorphous solid. [12] ii. State Kohlrausch Law and write mathematical expression of molar conductivity of the given solution at infinite dilution. iii. Write cell reactions in lead storage battery during discharge. 65

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