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Time: 3 HrsChemistry (Class 12th)Model Paper -3General Instructions:1. All questions are compulsory.2. Marks for each question are indicated against it3. Question numbers 1 to 5 are very short answer questions, carrying 1 mark each. Answer these in one word or about one sentence each.4. Question numbers 6 to 12 are short answer questions, carrying 2 marks each. Answer these in about 30 words each.5. Question numbers 13 to 24 are a/so short answer questions, carrying 3 marks each. Answer these in about 40 words each.6. Question numbers 25 to 27 are long answer questions, carrying 5 marks each. Answer these in about 70 words each.7. Use Log Tables, if necessary. Use of calculators is not permitted.1- A cubic solid is made of two elements X and Y. Atoms V are at the corners of the cube and X at the body centre. What is the formula of the compound?2- Two liquids A and B boil at 145°C and 190°C respectively. Which of them has a higher vapour pressure at 80°C?3- Write the IUPAC name of: CH3CH (Br)CH2CONHCH3.4- Give a chemical test to distinguish between aniline and N-methyl aniline.5- a. Draw the structure of XeF2 molecule. b. Write the outer electronic configuration of Cr atom (Z = 24). 6- Write balanced chemical equations for the following reactions: (2) i. Ca3P2 + H2O → ii. XeF6 + 3H2O →7- What are enantiomers? Draw the structures of the possible enantiomers of 3-methyl pent-1-ene.8- Write the reactions and the conditions involved in the conversion of: a. Propene to 1-Propanol b. Phenol to Salicyclic acid9- What is meant by ‘lanthanoid contraction’? State one use each of lanthanoid metals and their oxides.10- What happens when? i. Chlorine is passed through a hot concentrated solution of an alkali like Ba(OH)2 ? ii. XeF4 undergoes hydrolysis? Write the chemical equation in each case.11- How is the variability in oxidation states of the tansition elements different from that of the non transition elements? Illustrate with examples.12- How would you account for the following? (i) Phenols are much more acidic than alcohols. (ii) The boiling points of ethers are much lower than those of the alcohols of comparable molar masses.13- A Solution of glycerol (C3H8O3) in water was prepared by dissolving some glycerol in 500 g of water. This solution has a boiling point of 100.42 °C while pure water boils at 100°C. What mass of glycerol was dissolved to make the solution? (Kb for water = 0.512 K kg mol-1) 14- For the reaction 2NO + Cl2 → 2NOCl The following data were collected. All the measurements were taken at 263K:Write the expression for rate law.Calculate the value of rate constant and specify its unitsWhat is the initial rate of disappearance of Cl2 in exp. 4?15- State a reason for each of the following situations:Co2+ is easily oxidized to Co3+ in presence of strong ligan.CO is a stronger complexing reagent than NH3The Molecular shape of Ni(CO)4 is not the same as that of [Ni(CN)4]2-16- How would yoy account for the following?With the same d-orbital configuration (d4) Cr2+ is reducing agent while Mn3+ is an oxidizing agentThe actinoids exhibit a larger number of oxidation states than the corresponding members in the lanthanoid series.Most of the transition metal ions exhibit characterstic in colours in aqueous solutions.17- Write chemical equations for the following conversions:Nitrobenzene to benzoic acidBenzyl chloride to 2-phenylethanamine Aniline to benzyl alcohol18- What are the following substances? Give one example of each of themTranquilizersFood preservativesSynthetic detergents19- Although chlorine is an electron withdrawing group,yet it is ortho-, para-directing in electrophilic aromatic substitution reactions. Explain why it is so?20- Iron has a body centred cubic unit cell with a cell dimension of 286.65 pm. The density of Iron is 7.874 g cm-3. Use this information to calculate Avogadro’s number. (At.Mass of Fe = 55.845 u)21- Explain the following giving one example for each: (i) Reimer-Tie-mann reaction. (ii) Friedel Craft's acetylation of anisole.22- Define each of the following terms: (i) Micelles (ii) Peptization (iii) Desorption23- Describe the principle behind each of the following processes: (i) Vapour phase refining of a metal. (ii) Electrolytic refining of a metal. (iii) Recovery of silver after silver ore was leached with NaCN.24- Answer thefollowing: (i) Halo alkanes easily dissolve in organic solvents, why? (ii) What is known as a racemic mixture? Give an example. (iii) Of the two bromo derivatives, C6H5CH(CH3)Br and C6H5CH(C6H5)Br, which one is more reactive in SN1 substitution reaction and why?25- (a) Define the terms osmosis and osmotic pressure. Is the osmotic pressure of a solution a colligative property? Explain. (b) Calculate the boiling point of a solution prepared by adding 15.00 g of NaCl to 250.0 g of water. (Kb for water = 0.512 K kgmol–1, Molar mass of NaCl = 58.44 g)26- (a) Describe the followinggivinglinked chemical equations: (i) Cannizzaro reaction (ii) Decarboxylation (b) Complete the following chemical equations: 27- (a) Explain the mechanism of a nucleophilic attack on the carbonyl group of an acetaldehyde or a ketone. (b) An organic compound (A) (molecular formula C8H16O2) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid also produced (B). On dehydration (C) gives but-lene. Write the equations for the reactions involved.
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