Prototype Nickel Tin Catalytic Converter

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CHEMISTRY (Theory)
Time allowed : 3 hours General Instructions: (i) All questions are compulsory. Maximum Marks : 70

(ii) Marks for each question are indicated against it. (iii) Question numbers 1 to 8 are very short-answer questions and carry 1 mark each. (iv) Question numbers 9 to 18 are short-answer questions and carry 2 marks each. (v) Question numbers 19 to 27 are also short-answer questions and carry 3 marks each. (vi) Question numbers 28 to 30 are long-answer questions and carry 5 marks each. (vii) Use Log Tables, if necessary, Use of calculators is not allowed.

QUESTION PAPER CODE 56/1/1 1. 2. 3. 4. 5. 6. Write a feature which will distinguish a metallic solid from an ionic solid. Define ‘order of a reaction’. What is an emulsion? Why does NO2 dimerise ? Give an example of linkage isomerism. A solution of KOH hydrolyses CH3CHClCH2CH3 and CH3CH2CH2CH2Cl. Which one of these is more easily hydrolysed? Draw the structural formula of I-phenylpropan-l-one molecule. Give the IUPAC name of H2N – CH2 – CH2 - CH = CH2. 1 1 1 1 1

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Non-ideal solutions exhibit either positive or negative deviations from Raoult’s law. What are these deviations and why are they caused? Explain with one example for each type. A reaction is of first order in reactant A and of second order in reactant B. How is the rate of this reaction affected when (i) the concentration of B alone is increased to three times (ii) the concentrations of A as well as B are doubled? The rate constant for a reaction of zero order in A is 0.0030 mol L –1 s –1. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M ? Draw the structures of white phosphorus and red phosphorus. Which one of these two types of phosphorus is more reactive and why? Explain the following observations: (i) Generally there is an increase in density of elements from titanium (Z = 22) to copper (Z = 29) in the first series of transition elements. Transition elements and their compounds are generally found to be good catalysts in chemical reactions.

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(ii)

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Name the following coordination compounds according to IUPAC system of nomenclature: (i) (ii) [Co(NH3)4 (H2O)Cl]Cl2 [CrCl2(en)2]Cl, (en = ethane – 1, 2 – diamine) 2

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Illustrate the following reactions giving a chemical equation for each: (i) (ii) Kolbe’s reaction, Williamson synthesis. 2

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How are the following conversions carried out? (i) (ii) Benzyl chloride to benzyl alcohol, Methyl magnesium bromide to 2-methylpropan-2-ol. 175

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Explain the following terms. : (i) (ii) Invert sugar Polypeptides OR Name the products of hydrolysis of sucrose. Why is sucrose not a reducing sugar? 2

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What are essential and non-essential amino acids in human food? Give one example of each type. The well known mineral fluorite is chemically calcium fluoride. It is known that in – one unit cell of this mineral there are 4 Ca2+ ions and 8 F ions and that Ca2+ ions are – arranged in a fcc lattice. The F ions fill all the tetrahedral holes in the face centred –8 cubic lattice of Ca2+ ions. The edge of the unit cell is 5.46x10 cm in length. The –3 density of the solid is 3.18 g cm . Use this information to calculate Avogadro’s –1 number (Molar mass of CaF2 = 78.08 g mol ) A solution prepared by dissolving 1.25 g of oil of winter green (methyl salicylate) in 99.0 g of benzene has a boiling point of 80.31 °C. Determine the molar mass of this compound. (B.P. of pure benzene = 80.10 °C and Kb for benzene = 2.53 °C kg mol –1) What is the difference between multi molecular and macromolecular colloids? Give one example of each type. How are associated colloids different from these two types of col1oids ? Describe how the following changes are brought about: (i) (ii) (iii) Pig iron into steel. Zinc oxide into metallic zinc. Impure titanium into pure titanium. OR Describe the role of (i) NaCN in the...
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