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  1. S

    Chemistry: Post your doubts here!

    Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2. What is the change in oxidation number of sulfur in this reaction? A...
  2. S

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w10_qp_11.pdf Q 28 please explain!
  3. S

    Chemistry: Post your doubts here!

    thanks..what abt 4 Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2. What is the change in oxidation number of sulfur in...
  4. S

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w10_qp_11.pdf Q7
  5. S

    Chemistry: Post your doubts here!

    4 Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2. What is the change in oxidation number of sulfur in this reaction? A...
  6. S

    Chemistry: Post your doubts here!

    oops. my bad :p oh and btw they give this question again n again with some variation. in one of them they said it is a polar molecule. CO is a polar molecule right? sorry i knw its like basic stuff but im kinda freaking out right now!
  7. S

    Chemistry: Post your doubts here!

    oh ok so instead of carbon if they give hydrocarbon as an option it'll be included in the answer?
  8. S

    Chemistry: Post your doubts here!

    35 In a car engine, non-metallic element X forms a pollutant oxide Y. Further oxidation of Y to Z occurs in the atmosphere. In this further oxidation, 1 mol of Y reacts with ½ mol of gaseous oxygen. What can X be? 1 carbon 2 nitrogen 3 sulfur why cant it be carbon?
  9. S

    Chemistry: Post your doubts here!

    no its a great explanation..i got it..thanks :)
  10. S

    Chemistry: Post your doubts here!

    thamks. plz see if u can explain 21 of the same paper as well!
  11. S

    Chemistry: Post your doubts here!

    thanks..could you please solve 21 of the same paper?
  12. S

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_s10_qp_11.pdf Q4..plz explain!
  13. S

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_11.pdf Q4..plz explain!
  14. S

    A 2 Physics HELP !!! (TIPS, EXAM TYPICAL QUESTIONS AND DISCUSSION)

    i have the book too. but you know at the end of each chapter there are exam style questions and end of chap questions? where do we get answers for them? do u have them?
  15. S

    Chemistry: Post your doubts here!

    in ester formation, OH is from the acid and H from the alcohol combine to form water or is it the opposite?
  16. S

    Chemistry: Post your doubts here!

    Please explain how is the answer A??
  17. S

    Chemistry: Post your doubts here!

    its going to be 2x - 38 = -214. solve for x.
  18. S

    Chemistry: Post your doubts here!

    whats the answer?
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