CHEMISTRY MODEL QUESTION PAPER

SET 1

1. a. State the Law of Multiple Proportions (1)b. Among molarity and molality which is temperature dependent. (1)c. Calculate the mass percentage of all elements present in CaSO4 (2)2. Dual nature of matter was proposed by Louis De Broglie.a. Calculate the de Broglie wavelength associated with an electron with velocity 1.6X106ms-1 (3)b. State Paulis exclusion principle and Hunds rule of maximum multiplicity (3)3. a. Define Ionisation energy. Explain its variation along a period (2)b. What are representative elements? Write their general electronic configuration. (2)4. Bond order gives an idea about stability of a moleculea. Calculate the bond order of N2 molecule (2)b. Explain sp3 hybridisation using a suitable example (2)c. Draw the Lewis structures of BeF2 and H2S (1)5. a. Write any two postulates of kinetic theory of gases (2)b. Why mercury drops are spherical in shape? (1)c. Write Vander Waals equation for ‘n’ moles of a gas (1)6. a. Classify the following properties into extensive and intensiveVolume, Pressure, Temperature, Internal energy (2)b. What are the criteria for spontaneity of a reaction? (2)7. a. Classify the following as Lewis acids and bases.H2O, BF3, H+, NH4+ (2)b. pH of milk is 6.8. Calculate the concentration of H+ in it. (1)c. Predict whether the following salts are acidic, basic or neutral.KCl, NH4NO3, KF, CH3, COONa. (2)8. Calculate the odidation number ofa. 1. K in KMnO4. 2. P in H4P2O7 3. C in CO2 (1.5)b. Identify the oxidant and the reductant in the following reactions1. 2 Zn + O2  2 ZnO2. Zn + 2H+  Zn2+ + H2 (1.5)9. a. What are the causes of temporary and permanent hardness of water? (2)b. Using suitable examples show that water is amphoteric in nature. (2)10. a. Write the formula of : Gypsum, Washing Soda, Caustic Soda, Baking Soda (2)b. Explain the diagonal relationship with an example (2)11. a. Hybridisation of B in diborane is ____________ (1)b. CCl4 is not hydrolysable where as SiCl4 is hydrolysable. Why? (2)c. _________ is known as dry ice. (1)12. a. Draw the structures of :1. 2,2-dimethylpentane2. but-3-yn-1-ol3. 2-chloro-4-methyl pentane (3)b. Write the bond line representation of:1. Heptan-4-one2. 2,2-dimethyl butanol (2)c. Name the isomerism exhibited by CH3COOCH3 and CH3CH2OH (1)13. Complete the following.a. Anh.AlCl31. Benzene + CH3Cl ----------> ____________ + HClAnh.AlCl32. Benzene + 6Cl2 -------------> ____________ + 6HClDark (3)b. Write two examples for orthopara directing groups (1)c. Draw cis and trans isomers of CHCl=CHCl (1)14. a. What is Smog?b. What is BOD ?c. Write any two causes of water pollution. (3)