EKLAVYA EDUCATION

                         CLASS - XII CHEMISTRY MODEL PAPER – (043)—2017   SET-4 Time : Three hour                                                 Max. Marks : 70  General Instructions :-  1. All questions are compulsory.  2. Question No. 1-5 are very short answer questions and carry 1 mark each.  3. Question No. 6-10 is short answer questions and carries 2 marks each.  4. Question No. 11-22 is also short answer questions and carries 3 marks each.  5. Question No. 23 is value added questions and carry 4 marks.  6. Question No. 24-26 carry 5 marks  7. Use log tables if necessary, use of calculators is not allowed.  Q1.Give the monomeric structure of teflon.? 1  Q2. What are flux.How they are selected for a specific ores.? 1 Q 3. What do you mean by lanthanoid contraction. 1  Q4. Write IUPAC name of the following compound C6H5CH(OH)-COOC2H5 1  Q5. Mension one property which

                              TEST . XII –CBSE-CHEMISTRY (043),          MM=50           SURFACE,CO-ORDINATION,ISOLATION,D-BLOCK AND P-BLOCK *************************************************************************************************** Q1.Why pcl 5 is ionic in solid state.?                                                                           2 Q2.Why H 2 0 is liquid and H 2 S is gas.                                                                        2 Q3.Write disproportation reaction of phosphorous.                                                 2 Q4.Why KMnO 4 is colour yet it doesn’t have electron in d orbital.?                       2 Q5.Write only chemical reaction for the preperation of potasium permangnate and potasiun dichromate.?                                                                                                          2 Q6.Write the product  in a rection when XeF 6 react with 2H 2 O.                              2 Q7.What is r

    TEST . XII –CBSE-CHEMISTRY (043), MM=50 SURFACE,CO-ORDINATION,ISOLATION,D-BLOCK AND P-BLOCK *************************************************************************************************** Q1.Why pcl5 is ionic in solid state.? 2 Q2.Why H20 is liquid and H2S is gas. 2 Q3.Write disproportation reaction of phosphorous. 2 Q4.Why KMnO4 is colour yet it doesn’t have electron in d orbital.? 2 Q5.Write only chemical reaction for the preperation of potasium permangnate and potasiun dichromate.? 2 Q6.Write the product in a rection when XeF6 react with 2H2O. 2 Q7.What is role of NaCN in froath flatation process.? 2 Q8.What is leaching.Give example reaction of it with extraction of silver.? 2 Q9.What is van arkel process.? 2 Q10.Defference between calcination and roasting.? 2 Q11.What is electrophoresis,&coagulation.? 2 Q12.What is instability constant.How it is related to stepwise and overall stabilty costant.?

Q1) Thermodynamic principles are applicable to: A Only to the bulk of matter.   B. only to an individual atom or molecule.   C. only to the bulk of matter and not to individual atom or molecule.   D. none of these. Q2) A system which can exchange only energy but not matter with the surrounding is known as: A closed system.            B. open system.   C. isolated system.         D. none of these. Q3) Intensive property is one whose: A value depends upon the quantity of matter present in the system.   B. value depends upon the quality of matter present in the system.   C. value does not depend upon the quantity of matter present in the system.   D. value does not depend upon the quality of matter present in the system. .Q4) Among the following which one is a dependent variable. A Pressure.                     B. Temperature.   C. Both a and b               D. Volume. Q5) State function is a property which depends upon: A Initial state of system.   B. Fin