MP Board Class 12 Chemistry Past Paper PDF 2019

## Higher Secondary Supplementary Examination - 2019 **Chemistry (Hindi & English Versions)** - Total Questions: 18 - Total Printed Pages: 15 - Time: 3 Hours - Maximum Marks: 70 ### Instructions: 1. All questions are compulsory. 2. Question Nos. 1 to 4 are objective type questions, total 20 marks...

## Higher Secondary Supplementary Examination - 2019 **Chemistry (Hindi & English Versions)** - Total Questions: 18 - Total Printed Pages: 15 - Time: 3 Hours - Maximum Marks: 70 ### Instructions: 1. All questions are compulsory. 2. Question Nos. 1 to 4 are objective type questions, total 20 marks. 3. Question Nos. 5 to 7, each question carries 2 marks. (word limit 30 words) 4. Question Nos. 8 to 10, each question carries 3 marks. (word limit 75 words) 5. Question Nos. 11 to 15, each question carries 4 marks. (word limit 120 words) 6. Question Nos. 16 to 18, each question carries 5 marks. (word limit 150 words) 7. Internal options are given to Question Nos. 5 to 18. ### Question 1: Choose correct options: *Which kind of defects are introduced by doping?* - Dislocation defect - Schottky defect - Frenkel defect - Electronic defect *The role of a catalyst is to change…* - Gibbs' energy of reaction - Enthalpy of reaction - Activation energy of reaction - Equilibrium constant *At high concentration of soap in water, soap behaves as…* - Molecular colloid - Associated colloid - Macromolecular colloid - Lyophilic colloid *Which of the following elements does not show allotropy?* - Nitrogen - Bismuth - Antimony - Arsenic *Phosphorous acid (H3PO3) is…* - Monobasic - Dibasic - Tribasic - Tetrabasic ### Question 2: Fill in the blanks: - Radius ratio for _______ structural arrangement is 0.414 - 0.732. - In a physical adsorption, the value of heat of adsorption is in the range of _______ kJ/mol. - Most impure form of iron is _______. - The phenomenon of mercury sticking to glass due to ozone is called _______. - Neoprene is a _______ rubber. ### Question 3: Answer in one word: - Write the atomic radius (r) for simple cubic (SCC). - Write the name of ores, which is concentrated by froth floatation process. - Write the name of the product, which is formed by the reaction of primary amine with Grignard reagent. - Write the name of monomer unit of natural rubber. - Write the oxidation state of iron in K3[Fe(CN)6]. ### Question 4: Match the pairs correctly: Column “A” | Column “B” ------- | -------- Crystalline substance | Chromatography Coloured bands | Contact process Wood Laminates | Xerophthalmia Vitamin A | Beri-beri V2O5 | Melamine-HCHO resin | Anisotropy ### Question 5: Write any one difference between positive deviation and negative deviation in non-ideal solution with one example of each. **OR** Define colligative properties ### Question 6: Explain Gold number. **OR** Write any two differences among colloidal solution, true solution and suspension. ### Question 7: Write IUPAC names of the following: - [Co(NH3)6]Cl3 - K2[Zn(OH)4] **OR** Write any two importance of coordination compounds. ### Question 8: (i) Write the unit of molal depression constant (Kr). (ii) Calculate the osmotic pressure of 5% solution of glucose (C6H12O6) at 18°C. (R=0.082 lit atm K-mol-1) **OR** (i) Write the name of artificial semipermeable membrane. (ii) 1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol-¹. Find the molar mass of the solute. ### Question 9: (i) Write the chemical reaction for the nitration of aniline. (ii) Write the chemical reaction for the compling reaction of Benzene diazonium chloride with aniline. **OR** Differentiate 1º, 2º and 3º amine by the following three points: - reaction with nitrous acid. - reaction with alkyl halide. - reaction with Hinsberg's reagent. ### Question 10: Write the suitable conditions for enzyme catalyst. (any six) **OR** (i) Draw the open structure and pyranose structure of Glucose. (ii) Write any two examples of polysaccharides. ### Question 11: (i) Write any two differences between Rate of reaction and Rate constant. (ii) A first order reaction is found to have a rate constant, K = 5.5×10-14 s-1. Find the half-life of the reaction. **OR** (i) Write the unit of rate constant for zero order and first order reaction. (ii) Time required to decompose SO2Cl2 to half of its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction. ### Question 12: Write any six differences between Lanthanide and Actinides. **OR** Write only chemical equations for the preparation of Potassium permanganate from pyrolusite ore. ### Question 13: (i) Write only chemical reaction for unimolecular nucleophilic substitution reaction. (ii) Explain the following: a. BHC b. CCl4 **OR** Write only chemical reactions of the following: - Friedal-Crafts reaction. - Gattermann reaction. - Chemical equation for the manufacturing of D.D.T. - Wurtz reaction. ### Question 14: (i) Write the test to differentiate 1º, 2º and 3º alcohol by Lucas Test. (ii) Write chemical equation of Kolbe reaction. (iii) Write chemical equation for reaction of diethyl ether with acetyl chloride. **OR** Write any four differences for test between alcohol and phenol. ### Question 15: Write only chemical equations of the following: - Stephen's reaction - Cannizzaro reaction - Benzoin condensation - HVZ reaction (Hell-Volhard-Zelinsky reaction) **OR** Write only chemical equations of the following: - Acetic acid reacts with thionyl chloride. - Decarboxylation. - In presence of NaOH, acetone reacts with chloroform. - Tischenko reaction. ### Question 16: (i) Write equation and draw a figure to explain the electrochemical theory of rusting. (ii) For general electrode reaction Mn+(aq) + ne¯ → M(s), write the Nernst equation to evaluate the electrode potential. **OR** (i) Explain Kohlrausch's law and write its derivation. (ii) Determine for Acetic acid. Given: (HCI) = 426.0 2¯¹cm2mol-1 (CH3COONa) = 91.0 2¯¹cm²mol-1 (NaCl) = 126.0 2¯¹cm2mol-1 ### Question 17: (i) Write names of two poisonous gases which can be prepared from chlorine gas. (ii) Write four names of allotropes of sulphur. (iii) Write names and formulae of any two compounds of xenon. **OR** (i) Explain Interhalogen compounds and write two examples. (ii) Write oxidation state of sulphur in SF6, give the hybridisation of sulphur. (iii) Write two names and formulae of oxyacids of phosphorous. ### Question 18: Write two examples of each of the following: - Tranquilizer - Antiseptic - Analgesics - Antacids - Synthetized detergents **OR** (i) Explain Drug-Target interaction. (ii) Write four names of types of soap.