lilim I I I I I (i) 2013 III Seat No. Time: CHEMISTRY (Revised Syllabus Pattern 2012) INSTRUCTIONS: (i) All questions are compulsory.
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1 H-703-(010)(New) (i) [Conld III 09 Time: 2% Hours 1000 Seat No. I I I I I I CHEMISTRY (Revised Syllabus Pattern 2012) Paper Total No. of Questions: 5 Subject Code: lilim (Printed Pages: 13) Maximum Marks: 55 INSTRUCTIONS: (i) All questions are compulsory. (ii) Answer each main question on a fresh page. (iii) There is no overall choice, however internal choice has been provided in two sub-questions of 4 marks and two sub-questions of 2 marks each. (iv) Figures to the right indicate full marks. (v) Use of calculator is not permitted, however logarithmic table's will be provided on request. (vi) Multiple choice questions should be attempted only once.
2 1. (A) Select the correct alternative from those given below and rewrite the completed statement: An element with atomic mass 100 u having bee structure has edge length 400 pm. The density of the element is (Given NA ~ x 1023 atoms mol-l) g/cm g/cm g/cm g/cm3 (B) What is shape selective catalysis? (C) Explain the following observationa : 2 (i) Sky appears blue in colour. (ii) A freshly formed precipitate of ferric hydroxide can be converted to a colloidal sol by shaking it with a small quantity of ferric <Woride. 703-{01O) (New) CD [Contd...
3 (D) Draw a neat labelled diagram to show metal excess defect due to anionic vacancy. What colour is developed when excess of K is present in KCI crystal? (E) Name one chemical compound used in soaps to impart antiseptic properties to it and also name one non-narcotic analgesic which can be used as an antipyretic and to prevent platelet coagulation. 2 (F) Answer the following: 3 (i) Write the IUPAC name of the coordination compound: k[ci\h20)2(c204)2]' (ii) Name the type of isomerism exhibited by : [Co(N02)(NHa)5] Cl2 and [Co(ONOXNHa)5]CI2' (iii) Draw the structures of optical isomers of : [PtCI2(en)2J2+. -(OlO)(New) CD [Contd...
4 2. (A) Select the correct alternative ITom those given helow and rewrite the completed statement Alkyl halides are prepared from alcohols hy treating with... CU2CI2 + HCI. KCI+ HN03. HCI + ZnCI2. CI21 UV light (B) Draw a neat lahelled schematic diagram to show the magnetic sepa~ation of ore. (C) Descrihe the role of the following 2 (i) Cryollite or CaF 2 in. the metallurgy of Aluminium. (ii) Collectors in the IToth-floatation process. H-703--(OlO)(New) CD IContd...
5 (D) Complete the following chemical equations: 2 (i) C6H5Cl + CHsCOCl Anhydrous AICI,, (ii) C2H5CI + Na dry ether, (E) Answer the following: (i) Write the structures of monomers in the following polymer 0 0 II II [-C-(CH2),O-C-NH-(CH2),-NH-]n (ii) Classify the following as addition and condensation polymers : Dacron, Polythene, Nylon 6, 6 Bakelite. (F) Give scientific reasons for the following : (i) Protein loses its biological activity when subjected to change in temperature and ph. (ii) A person suffering from pernicious anaemia is advised to consume meat, fish, egg and curd. (iii) Sncrose is a non-reducing disaccharide. -(OlO)(New) (5) [Contd...
6 3. (A) Select the correct alternative from those given below and rewrite the completed statement: The differential rate law for the reaction H ; 2HI is d[h2! -2d[I,] d[h!] dt dt dt..! d[h,j =.!d[l,! - d[hi] 2 dt 2 dt dt. d[h,! d[i,! =.! d[hi] dt dt 2 dt. -d[h,! = -d[i,! = -d[hi! dt dt dt (8) What is the order of a reaction whose rate constant has the same units as the rate of a reaction? (C) For a decomposition reaction the value of rate constant at two different temperatures are as follows: 2 k, =2.15 x IO-s 8-1 at 650 K, 1,2 = 2.39 x 10-7 s-1 at 700 K Calculate the energy of activation (R = JK-l mol-l) {01O)(New) CD [Conal...
7 (C) The initial concentration of NZOS in the following first order reaction: 2 N, NO + i!.02 was 1.24 x 10-2 mol L-1 at 318 K 2 The concentration of NZOS after 60 minutes was 0.20 x 10-2 mol L-1 Calculate the rate constant of the reaction at 318 K (D) Write complete chemical equations for fthe following : 2 (i) Oxidation of FeZ+ by CrzO - in acidic medium. (ii) Oxidation of S,O~- by MnO. in neutral aqueous medium. (E) Explain giving reasons : 2 (i) Transition metals and their compounds are generally found to be good catalysts. (ii) The actinoids exhibit a larger number of oxidation states than the corresponding lanthanoids. (F) A solution is prepared by mixing cyclohexane and ethanol. Draw a graph and name the type of deviation from Raoults law observed for this. What type of azeotrope will be formed? -(OlO)(New) (2) (Conld...
8 I. (A) Select the correct alternative from those given below and rewrite the completed statement Osmotic pressure of a solution containing 6.0 g protein in 150 ml aqueous solution at 27 C is 1.5 x 10-1 atm. The molar mass of the protein is g mol-l (R = L atm K-l mol-i) (B) Write a chemical labelled equation to show the reaction of aniline with chloroform in presence of ethanolic KOH. (C) Answer the following: (i) Arrange the following in the decreasing order of their basic strength: NHs, C6HSNH2 and C2HSNH2' (ii) Write a chemical equation to show the conversion of benzene diazonium chloride to a yellow dye (010)(New) CD [Contd...
9 (C) Answer the following 2 (i) Explain why tertiary amines are less soluble in water than primary and secondary amines? (ii) Write a chemical equation to show the conversion of benzene diawnium cbloride to fluorobenzene. (D) IdentifY A and B in the following chemical equations: 3 (i) A Oleum (i) NaOH - ---> 0? B. (ii) ~ CrO" HCHO (i) CH,MgBr, ~ (ii)h,o' ONa CH,I)A~ Ethanoic acid B (Major proudct) HOlO)(New) CD [Contd...
10 (1<:) With reference to p-block elements answer the following 4 (i) Arrange the hydrides of Group 16 in the order of their decreasing thermal stability. (ii) Complete and balance the following chemical eqnation Ag + PClS -7 (iii) Explain why elements of Group 16 show lower value of ionisation enthalpy compared to elements of Group 15? (io) Draw the structure of sulphurous acid. Or (E) With reference to p-block elements answer the following 4 (i) Arrange the hydrogen halides in the increasing order of their stability. (ii) Complete and balance the following chemical equation: Mn 2 + HCI -7 [Conld...
11 (iii) Explain why fluorine exhibits only -1 oxidation state where as other halogens exhibit + 1, + 3, + 5 and + 7 oxidation states? (iv) Draw a structure of XeOF4. (A) Select the correct alternative from those given below and rewrite the completed statement: (i) Br,lRed P The chemical reaction, RCH2 COOH. 'R-CH-COOH (ii)h,o Br I is known as. Swarts reaction. Hell. Vo!hard Zelinsky reaction. Wurtz reaction. Hoffinann. reaction (B) Calcnlate the number of Coulombs reqwred to deposit 6.75 grams of Aluminium. (Atomic mass of AI = 27 u, F = Coulomb) [Contd...
12 (C) Name the property by which white phosphorous glows in the dark. Write a balanced cbemical equation to show the reaction of white phosphorous in air. 2 (D) Draw a scbematic diagram for the following representation of a Galvanic cell and calculate its e.m.. if E"cen = 1.05 V at298k: Ni INi(NOa)2(O.270M) II AgNOa(O.OOlM) lag. (E) An alkyl benzene undergoes rigorous oxidation with alkaline KMn04 followed by hydrolysis to give compound A. Compound A when treated with thionyl chloride formed compound B. Compound B reacts with dimethyl cadmium to give compound C. Compound C on treatment with zinc amalgam in presence of concentrated HCI gave compound D. Write the sequence of all the chemical reactions involved and identify compounds A, B, C and D. 4
13 (E) Benzenereacts with carbon monoxide and HCI in presence of anhydrous AICIS.to give compound A. Compound A on treatment with concentrated KOH gave compound B, along with a salt of an acid. Compound B wben oxidised with alkaline KMn04 follbwed by hydrolysis gave compound C. Compound C when heated with phosphorous pentoxide in presence of an acid gave compound D. Write the sequence of the chemical equations involved and identify compounds A, B, C, and D. 4
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