<p> Model Paper</p><p>Chemistry (10 th )</p><p>Total Time: 3 Hours Max: Marks: 65 Note: There are THREE Sections of this Paper i.e. A.B and C, attempt each according to the given instructions. Time: 20 Minutes SECTION-A Marks: 12 Note: Attempt all parts of Section – A. Section –A must be return to the superintendent after 20 minutes even if you have not attempted any question. Overwriting/ defacing/Cutting etc is prohibited in Section-A and no credit will be given to such answer.</p><p>I. Write the correct option i.e. A/B/C/D in the empty boxes.</p><p> i. Molecule of chlorine do not decompose into atomic chlorine because Kc for this</p><p> reaction Cl2 2Cl is (A) Very large (B) Very Small (C) Zero (D) 1</p><p> ii. NH3 is ______.</p><p>(A) Acid (B) Base (C) Salt (D) Buffer Solution</p><p> iii. The Sum of PH and POH for neutral Solution is ______.</p><p>(A) 7 (B) 14 (C) 5.6 (D) 9 </p><p> iv. Dehydration of ethyl alcohol with Conc. H2SO4 results in the formation of ______. (A) Ethane (B) Methane (C) Acetylene (D) Ethene</p><p> v. The general formula for Alkenes is ______.</p><p>(A) CnH2nOn (B) CnH2n-1 (C) CnH2n-2 (D) CnH2n</p><p> vi. ______is a factor related to blood clothing. (A) Vitamin A (B) Vitamin B (C) Vitamin C (D) Vitamin K</p><p> vii. The major component of Stratosphere is ______.</p><p>(A) Ozone (B) Nitrogen (C) Oxygen (D) Carbon</p><p> viii. The chemical formula of magnetic oxide is ______.</p><p>(A) Fe3O4 (B) Fe2O3 (C) FeO (D) Fe2O3 .</p><p>H2O</p><p> ix. Chorine acts as bleaching agent in the presence of ______.</p><p>(A) HCl (B) H2 O (C) NaOH (D) HNO3</p><p> x. Raw material used for manufacturing urea are ______. </p><p>(A) CO2 and NH3 (B) H2 and NH3 (C) HCl and NH3 (D) Non of these</p><p> xi. The homologous have the same ______. (A) State (B) Color (C) Density (D) Chemical properties</p><p> xii. Fats and oils are called ______. (A) Carbohydrates (B) Lipids (C) proteins (D) Vitamins</p><p>Model Paper</p><p>Chemistry (10 th )</p><p>Note: Time allowed for section B and C is 2 hours and 40 minutes. </p><p>SECTION “B” Marks: 32 II. Attempt any EIGHT Parts out of the following. Each Part carries equal marks.</p><p> i. What is meant by equilibrium constant? Give its unit.</p><p> ii. What are strong acids and strong bases? Give examples.</p><p> iii. Describe neutralization reaction with examples.</p><p> iv. How alkenes are prepared?</p><p> v. Write briefly the composition of Nucleic acids.</p><p> vi. What are the physical properties of Ozone.</p><p> vii. Water is a universal Solvent. Briefly explain.</p><p> viii. How sodium carbonate is commercially prepared.</p><p> ix. Describe briefly bonding in protein molecule.</p><p> x. What is meant by Global warming?</p><p> xi. What are the physical properties of Alkanes. </p><p>SECTION “C” Marks: 21</p><p>Note: Attempt any THREE questions of the following. Each question carries equal Marks.</p><p>III. (a) What are Salts? Give its types. (b) What are the various concepts about acids and bases?</p><p>IV. (a) Give general characteristics of organic compounds? (b) Write any two methods for preparation of Alkynes? </p><p>V. (a) Write balanced chemical equations for the chemical reaction of water with:</p><p> i. Cl2 ii. Fe iii. C iv. NO2 (b) What do you mean by hard water? How hardness of water is removed?</p><p>VI. (a) Describe classification of carbohydrates? (b) Write short note on the importance of Atmosphere?</p>