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  1. S

    Chemistry: Post your doubts here!

    I wish i had the link by begining of my A levels , now the time is up :confused:
  2. S

    Chemistry: Post your doubts here!

    OMG , then how do you study !! :love: Give us the tip :P
  3. S

    Chemistry: Post your doubts here!

    how comes ? the nmr stuff and inhibitor and bonds and all that stuff are there in our textbook but the design and drug part is always new question which are not related to what you study in the textbook!!
  4. S

    Chemistry: Post your doubts here!

    Textbook ? because i never saw a question from the textbook !
  5. S

    Chemistry: Post your doubts here!

    The last question of application is OUt of the book right?
  6. S

    Chemistry: Post your doubts here!

    1.8=1.8 , so its one ? why your answer and MS answer is zero :P
  7. S

    Chemistry: Post your doubts here!

    Order wrt ( H+ )
  8. S

    Chemistry: Post your doubts here!

    Abby can you answer the question of paper5 posted ab ahmed abdullah
  9. S

    Mathematics: Post your doubts here!

    Second part of vectors From mj2013 , va'31 A star
  10. S

    Mathematics: Post your doubts here!

    Whats we do when they say " e straight line through P parallel to the x-axis " example: http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s13_qp_31.pdf
  11. S

    Mathematics: Post your doubts here!

    when we differtiate equation we get Velocity equation so to find time when V=0 , we equate zero with the equation of velocity , so we get t=0 & t=100 question says clearly v=0 , when start at rest and when reach B , read the question , so 0 is time at A , and 100 is time at B
  12. S

    Mathematics: Post your doubts here!

    Did you open the bracket when differetiating ? you should do that !
  13. S

    Physics: Post your doubts here!

    Paper 5 http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w12_qp_53.pdf how to find error in first row of question 2 , i am getting 0.1 but marking scheme dont accept this answer and say dont allow
  14. S

    Chemistry: Post your doubts here!

    See if you can help with this : was arguing with someone and didnt reach conclusion : https://www.xtremepapers.com/community/threads/chemistry-post-your-doubts-here.9859/page-388#post-749668 Last part
  15. S

    Chemistry: Post your doubts here!

    Its , Cl2 + KI ---> KCl + I2 Oxidation state of element is zero .. and in KI oxidation state of iodine is -1 ... therefore it changes from -1 to 0 ( increase in oxidation state ) which is oxidation
  16. S

    Chemistry: Post your doubts here!

    Hydrogen bond is between hydrogen and highly electronegative ion ( N , O , F ) .. so B only has this H --- N in ammonia
  17. S

    Chemistry: Post your doubts here!

    My friend you said it , " less positive have more tendency to get oxidised... " So its oxygen which will be at anode ( less positive E value ) NOT Br .. :LOL:
  18. S

    Chemistry: Post your doubts here!

    02+2H2O+4e=4OH- E value is +0.40V Br2+2e=2Br E value is + 1.07V OH has lower ( more negative ) Evalue , so it will be at anode ???????
  19. S

    Chemistry: Post your doubts here!

    Can you elaborate the point ? or compare it with the other two ? For cathode > more positive E vlaue will go to cathode and no doubt in that .. What about anode?
  20. S

    A level Biology: Post your doubts here!

    Can you help in labelling
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