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
1 1 1
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.
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
Illustrate the following reactions giving a chemical equation for each: (i) (ii) Kolbe’s reaction, Williamson synthesis. 2
How are the following conversions carried out? (i) (ii) Benzyl chloride to benzyl alcohol, Methyl magnesium bromide to 2-methylpropan-2-ol. 175
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
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...