| SET-1 Time Allotted: 03:00:00 | Maximum Marks: 70 |
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| 1.All questions are compulsory. 2.Marks for each question are indicated against it. 3.Question numbers 1 to 8 are very short-answer questions each of 1 mark. Answer them in about one sentence each. 4.Question numbers 9 to 18 are short-answer questions of 2 marks each. Answer them in not more than 30 words each. 5.Question numbers 19 to 27 are short-answer questions of 3 marks each. Answer them in not more than 40 words each. 6.Question numbers 28 and 30 are long-answer questions of 5 marks each. Answer them in not more than 70 words each. 7.Use Log Tables, If necessary. 8. Please give the explanation for the answer where applicable. 9. To view the answer, click on the Answer link alongside the Question. |
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Q 1)Write IUPAC name of phenetole. 1 Marks
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Q 2)An element is found to have fcc structure. How many atoms are present in its one unit cell? 1 Marks
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Q 3)Name the poisonous gas which chloroform produces on reaction with air and oxygen. 1 Marks
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Q 4)Name an experiment/ property which confirms the heterogeneous nature of colloidal solutions. 1 Marks
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Q 5)Predict the shape of XeO3 on the basis of VSEPR theory. 1 Marks
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Q 6)Give one use of reverse osmosis. 1 Marks
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Q 7)Why does CaO react with SiO2 to form a slag? 1 Marks
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Q 8)Write a balanced chemical equation for reaction between chlorine and excess of ammonia. 1 Marks
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Q 9)Calculate the freezing point of a solution containing 50.0 g of ethylene glycol (Molecular weight =62) dissolved in 600 g of water. (Kf for water=1.86 K kg mol-1) 2 Marks
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Q 10)(i) A reaction follows second order kinetics. How is the rate of reaction affected if the concentration of the reactant is reduced to half?
(ii) The rate constant of a reaction is 6.0 x 10-4 s-1. Find the order of the reaction. 2 Marks
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Q 11)What is vapour phase refining? What are the necessary requirements for the compound to be purified by vapour phase refining? 2 Marks
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Q 12)(i) Write basic constituents of a nucleotide.
(ii) Name the nitrogenous base which is present in RNA and not found in DNA. 2 Marks
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Q 13)(i) What is the name given to the linkage which holds together two monosaccharide units in a polysaccharide?
(ii) Name a polysaccharide found in animals. 2 Marks
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Q 14)(i) In Williamson synthesis why the yield of ether is not good with 2º and 3º alkyl halides?
(ii) Explain why the alkoxy group is ortho, para directing? 2 Marks
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Q 15)(i) What is diazotization?
(ii) Identify and write the names of (X), (Y) and (Z)  2 Marks
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Q 16)Convert
(i) Propanal to butanone
(ii) Propanone to iodoform. 2 Marks
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Q 17)Write balance chemical reactions and name of the major product for the following
(i) Ethylamine reacts with nitrous acid.
(ii) Benzene diazonium chloride reacts with ethyl alcohol. 2 Marks
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OR
Convert Ethanoic acid into Methanamine. 2 Marks
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Q 18)Explain the following
(i) People taking a lot of salt in their diet suffer from edema.
(ii) Equimolar solutions of glucose and KCl are not isotonic. 2 Marks
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Q 19)Atomic mass of an element is 100. It has bcc structure. Its density is 5.96 g cm-3. Calculate the volume of the unit cell. 3 Marks
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Q 20)(a) Write one use of polyacrylonitrile.
(b) Name the monomer unit of neoprene.
(c) What is the role of sulphur in vulcanization of rubber? 3 Marks
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Q 21)(a) Write IUPAC name of[Cr(NH3)4(H2O)3]Cl3
(b) Find the oxidation state of central metal atom in the following
[Co(NH3)5ONO]Cl2
(c) Predict the geometry and magnetic behavior of [Ni(CO)4] 3 Marks
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Q 22)Give reasons for the following ?
(a)(i) The air becomes dry when passed over silica gel.
(ii) Colloidal medicines are more effective in treatment of diseases.
(b)(i) Which of the following will be most effective in coagulating Fe(OH)3 sol?
NaCl, MgCl2 , Na3(PO4), K4[Fe(CN)6]
(ii) Give one example each of O/W and W/O type of emulsions. 3 Marks
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Q 23)Account for the following
(a) Fluorine does not exhibit positive oxidation state like other group members.
(b) Noble gases have low boiling points.
(c) Ammonia behaves as Lewis base. 3 Marks
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Q 24)(a)What are the factors which effect the rate of reaction?
(b) 30% of a first order reaction was completed in 90 minutes. Calculate the time taken for the reaction to go to 80% completion? 3 Marks
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Q 25)(a)Complete and name the following reaction-
CH3CH2Cl +NaI  (b)Arrange the following in increasing order of reactivity towards SN2 reaction
CH3Br,CH3Cl,(CH3)2CHCl,CH3CH2Cl
(c)What are enantiomers? 3 Marks
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Q 26)Complete the following reactions
(a) NH4Cl(aq) + NaNO2(aq) ?
(b) PbS(s) + O3(g) ?
(c) 2XeF2 + 2H2O ? 3 Marks
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OR
X2 is a greenish yellow gas with an offensive smell and is used in water purifications. It partially dissolves in water to give a solution which turns blue litmus red. When X2 is passed through NaBr solution, Br2 is obtained. Identify X2, name the group to which it belongs, write general electronic configuration of the group. Name the main products obtained when X2 reacts with dry slaked lime? Write equations also. 3 Marks
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Q 27)(a) Name one narcotic analgesic.
(b) Detergents are called soap less soap. Why?
(c) Aspartame is used as artificial sweetener only in cold food and soft drinks and not in food stuff which is prepared by cooking (heating).Why? 3 Marks
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Q 28)(a)The value of ?º for HCl, KCl and CH3COOK are 425.1, 121.3 and 94.0 ohm-1 cm2 mol-1 respectively. Calculate ?º acetic acid.
(b)How many coulombs are required for the reduction of 1 mol of Cu2+ to Cu?
(c)Electrolysis of KBr (aq) gives Br2 at anode but KF (aq) does not gives F2 at anode. Why? 5 Marks
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OR
(a) The resistance of 0.02 M KCl solution in a conductivity cell was found to be 1100 ohms. The conductivity of this solution is 4.5 x10-3 Scm-1 . Calculate the cell constant.
(b) What are the units of molar conductivity?
(c) Write Nernst equation for the following cell
Mg(s)/ Mg2+ (0.01M) ? Cu2+ (0.0001M) / Cu (s)
5 Marks
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Q 29)(a) Give reasons for the following
(i) Zn, Cd and Hg are not considered as transition metals.
(ii) Transition elements show variable oxidation states.
(iii) It is difficult to separate the lanthanoids elements in pure state.
(iv) Zn2+ compounds are colourless while Ni2+ salts are blue.
(v) Mercury is liquid while Cr is solid at room temperature. 5 Marks
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OR
(a) Indicate the steps and chemical reactions involved in preparation of K2Cr2O7 from chromite ore.
(b) (i)Complete the following reaction
2KMnO4 + 5H2C2O4 + 3H2SO4 ?
(ii) Which is more stable and why? Cu+ or Cu2+. 5 Marks
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Q 30)(i) Distinguish between the following pairs
(a) Acetophenone and benzophenone
(b) Acetaldehyde and acetic acid
(ii) Why HCOOH do not give HVZ reaction but CH3COOH does?
(iii) An organic compound (A) forms white precipitate with NaHSO3, gives negative Fehling's test and negative iodoform test. It is reduced to n-pentane on treatment with Zn-Hg/HCl. Identify the compound (A) and write its IUPAC name. 5 Marks
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OR
(i)An organic compound (A) reacts with acetic acid in presence of sulphuric acid to form a sweet smelling compound (B).On hydrolysis (B) gives (A) and acetic acid. On reduction (A) forms (C). (C) is a pungent smelling liquid which is used as preservative for biological specimens and in manufacture of Bakelite. Identify compound (A), (B) and (C).
(ii)Represent the following chemical changes by balanced chemical reactions?
(a)Benzoyl anhydride is hydrolysed.
(b)Propanoic acid is heated with phosphorus pentachloride. 5 Marks
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