KENDRIYA VIDYALAYA IIT Campus, Chennai Holiday Home Work Summer Vacation. Class XII- CHEMISTRY
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1 KENDRIYA VIDYALAYA IIT Campus, Chennai Holiday Home Work Summer Vacation Class XII- CHEMISTRY 1 Q and Ans Of Solid state, solution, chemistry in everyday life, polymer- Enclosed 2 Two chapters of animated PPT by each student 3 Investigatory project of your own choice/cbse listed can be prepared and submitted on 25/06/2016, further modification will be guided by the subject teachers 4 Prepare thoroughly for the achievement test in solid state and solution Solid State: 1 It is face centered cubic lattice A metal has cubic lattice Edge length of lattice cell is 2A 0 The density of metal is 24g cm -3 How many units cell are present in 200g of metal 2 A metal crystallizes as face centered cubic lattice with edge length of 450pm Molar mass of metal is 50g mol -1 The density of mental is? 3 A compound forms hexagonal close packed structure What is the total number of voids in 05 mol of it? How many of these are tetrahedral voids? 4 Copper Crystallizes into FCC lattice with edge length 361*10-8 cm Show that calculated density is in agreement with measured value of 892g/cc 5 Niobium crystallizes in bcc structure with density 855g/cc, Calculate atomic radius using atomic mass ie 93u Solution: Q 1 (a) Define the following terms 1 Mole fraction 2 Ideal solutions (b)15 g of an unknown molecular material is dissolved in 450 g of water The resulting solution frrezez at c what is the molar mass of material? Kf for water= 186 K Kg mol -1 Q 2(a) Explain the following :
2 1 Henry s law about dissolution of a gas in a liquid 2 Boling point elevation constant for a solvent (b)a solution of glycerol (C 3 h ) in water was prepared by dissolving some glycerol in in 500 g of water The solution has a boiling point of c what mass of glycerol was dissolved to make this solution? Kb for water = 0512 k Kg mol -1 Q 3 2 g of benzoic acid (c 6 h 5 cooh) dissolved in 25 g of benzene shows a depression in freezing point equal to 162 K KF for benzene is 49 K Kg mol -1 What is the percentage association of acid if it forms dimer in solution Q 4 Osmotic pressure of a molar solution of an electrolyte is found to be 070 atm at 27 0 c calculate Vant Hoff factor( R=0082 L atom mol -1 K -1 ) Ans 276 Polymers 1Give the common and the IUPAC name of the monomer of natural rubber 2Discuss the two main purpose of vulcanization of rubber 3Explain the term Thermosetting polymers and give one example 4 Why should one always use purest monomer in free radical polymerisation? 5How is dacron obtained from ethylene glycol and terephthalic acid? SA-II(3 marks) 1What does the following polymers stand for? (i)pvc (ii) DOP(iii) PAN 2 Why is Bakelite a thermosetting polymer? Acid polymerisation 4 C 6 H 10 =NOH A B Give the products A& B 5(i) Give an example of a synthetic rubber (ii) Mention main advantage of synthetic rubber (iii)arrange the polymers in the increasing order of tensile strength Nylon-6, Buna-S, Polythene Chemistry In Every day life
3 SHORT ANSWER TYPE QUESTION (2 marks) Q-1 Mention one important use of the following- (i) Equanil (ii)sucrolose Q-2 Define the following and give one example- (i)antipyretics (ii) Antibiotics Q-3 Name the medicines used for the treatment of the following- (i) Tuberculosis (ii) Typhoid Q-4 what are tincture of iodine? Q- 5 What is artificial sweetening agent? Give two examples? Q-6 How is synthetic detergents better than soaps? Q-7 what are sulpha drugs? Give two examples? Q-8 what forces are involved in holding the active sites of the enzymes? Q-9 Describe the following giving an example in each case- (i) Edible colours (ii) Antifertility drugs (i) as antiseptics? SHORT ANSWER TYPE QUESTION (3 marks) Q-1 what are Biodegradable and non-biodegradable detergents? Give one example of each Q-2 what are barbiturates? To which class of drugs do they belong? Give two examples Q-3 what is the use of (i) Benadryl (ii) sodium benzoate (iii) Progesterone Q-4 Identify the type of drug- (i) Ofloxacin (ii) Aspirin (iii) Cimetidine
4 Ans- 4 (i) Antibiotic (ii) Analgesics & Antipyretics Q-5 Describe the following with suitable example- (i) Disinfectant (ii) Analgesics (iii) Broad spectrum antibiotics
5
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FAHAHEEL AL WATANEIH INDIAN PRIVATE SCHOOL
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1) Define the following terms: a) solution, b) miscible, c) hydration, d) percent by mass (solute), e) colligative property, f) hypotonic.
Problems - Chapter 13 (with solutions) 1) Define the following terms: a) solution, b) miscible, c) hydration, d) percent by mass (solute), e) colligative property, f) hypotonic. a) solution - A homogeneous