Chemistry

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   CHEMISTRY
 
Guess Paper – 2013
Class – XI
Subject - CHEMISTRY   
     MAX MARKS=90
……………………………………………………………………………………… General instructions:
All questions are compulsory.
Marks for each question are indicated against it.
Questions number 1to 8 are very short –answer questions, carrying 1 mark each. Answer these in one word or about one sentence each. Questions number 9 to18 are short –answer questions, carrying 2 marks each. Answer these in about 30 words each. Questions number19 to27 are short –answer questions, carrying 3 marks each. Answer these in about 40 words each. Questions number28 to30 are long-answer questions of 5 marks each. Answer these in about 70 words each.       7 Use log tables if necessary. Use of calculators is not permitted          QUESTIONS:

 
1.Define molality.                                                                                                                               (1)  
2.Calculate the number of lines when an electron jumps from 6th level to 2nd level.                            (1)  
3. If two discharge tubes A and B are filled with Hydrogen and oxygen respectively, will the electrons and gaseous cations be the same?  Justify your answer.                                                                                          (1)  

4. Which of the two is paramagnetic:V+4  or V+5 and why?                                                                 (1) 5 How cathode rays are originated in the discharge tube and how their origin differs from the origin of anode rays? 6 When is a cation highly polarizing? Which alkali metal has the highest polarizing power?               (1) 7.Why is KO2 paramagnetic?                                                                                                               (1) 8 Potassium and Caesium are used in photoelectric cells. Why?                                                                      (1) 9 Concentrated sulphuric acid is 98% H2SO4 by mass and...
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