Chemistry Class 11 papers, Study notes of Chemistry

Download Chemistry Class 11 papers and more Study notes Chemistry in PDF only on Docsity! myCBSEguide.com A Complete guide for CBSE students Sample Paper-05 Chemistry (Theory) Class - XI Time allowed: 3 hours Maximum Marks: 70 General Instructions: a) Allthe questions are compulsory. b) There are 26 questions in total. c) Questions 1 to 5 are very short answer type questions and carry one mark each. d) Questions 6 to 10 carry two marks each. e) Questions 11 to 22 carry three marks each. f) Questions 23is value based question carrying four marks. 8) Questions 24to 26 carry five marks each. h) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions in five marks each. You have to attempt only one of the choices in such questions. i) Use of calculators is not permitted. However, you may use log tables if necessary. 1. Ifa metal is higher than a particular metal in electrochemical series, will it be stronger reducing agent or weaker reducing agent? Why? 2. If the critical temperature for carbon dioxide and m: @ are 31.1°C and - 81.9°C respectively, then which of these has strong intermolecular forc ive reason. 3. Which of these contain the largest number of atoms - 1.0 g Li(s) and 1g Na(s)? 4. Predict the shape of the PH, molecule according to VSEPR theory. 5. Give reason: “Metallichydrides are usedferstcringhydrogen”. 6. (a)Name the energy which arises due to motion of atoms or molecules in a body. (b) How is this energy affected when the temperature is increased? Or Give the relationship between isothermal and free expansion of an ideal gas. 7. Predict the formulae of the stable binary compounds that would be formed by the combination of the following pairs of elernents: (a) Element 71 and F (b) Al and I (c) SiandO (c) Pand F. 8. Why the bottle containing hydrogen peroxide should be cooled before opening? 9. Why Be and Mg does not give colour to flame than the alkaline earth metals? 10. Calculate the molality of the solution if the density of 3M solution of NaCl is 1.25g/mL. 11. What happens when (a) Sodium metal is dropped in water? (b) Sodium metal is heated in free supply of air? (c) Sodium peroxide dissolves in water? 12. Justify giving reactions that among halogens, fluorine is the best oxidant and among hydrohalic compounds, hydroiodic acid is the best reductant? 13. Write the balance equation for the following: Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks ‘ Be. ny CBSEguide. com A Complete guide for CBSE students BE,+LiH 3 B,H,+H,0 3 (iii) NOW + BH, > a (iv) H,BO,— (v) Al+ NaOH > _, B,H,+NH, > (wi) 14, Explain the principle of paper chromatography? 15. Write a brief note on the following environmental terms: (i) Acid rain (ii) Eutrophication (iii) Green Chemistry 16.A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased. (a) How do rates of evaporation and condensation change initially? (b) What is the initial effect of the change on vapour pressure? 17. (a) How would you distinguish between BeSO , and BaSO ,? (b) Which is thermally most stable alkaline earth metal carbonate among MgCO,,, CaCO, SrCO,, BaCO.,? Give reasons. 18. Derive the structure of: (a) 2-Chlorohexane (b) Pent-4-en-2-ol (c) 3- Nitrocyclohexene (d) Cyclohex-2-en-1-ol @ (ii) Or Why NHs has a higher dipole moment than NF 3? 19. Why is the entropy of a substance taizen. as zero at 0 K? calculate the standard Gibbs free energy change for the reaction N,(8)+3H,(g) © 2NH3(8) at 298 K, N,(g)+3H,(g) @ 2NH,(g) at 293 K. The Value of equilibrium coristant for the above reaction is 6.6 x 105. [R=8.314 J K? mol] 20. Define the following: (a) Critical temperature (b) Avogadro law (c) Charles Law 21. Define: (i) Lattice enthalpy (ii) Bond length (iii) Bond angle. 22. (i) Name the class of hydrides to which H20 and NaH belong. (ii) What do you understand by the term hydride gap? (iii) What do you mean by 15 volume H202 solution? 23. Ram uses urea and DAP for his crops whereas Shyam uses compost. Ammonia is prepared by Haber’s process. It is used for making fertilizers. If it is used in excess, it is harmful for crops. (i) What is DAP? (ii) What can be done with waste products? Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks