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  1. Shadman Azad

    Biology; Chemistry; Physics: Post your doubts here!

    gud explanation....(y)...so the ans is A.
  2. Shadman Azad

    Chemistry Doubts: Paper 1 & 2

    sourov97 what are the sources and effects of atmospheric pollutants?
  3. Shadman Azad

    Chemistry Doubts: Paper 1 & 2

    is this included in our syllabus?:sick: ....ozone prevent harmful rays...(b) O3 + Cl2 = Cl2O + O2 (unsure):unsure:
  4. Shadman Azad

    Chemistry Doubts: Paper 1 & 2

    thanks:D surely this helps.
  5. Shadman Azad

    Chemistry Doubts: Paper 1 & 2

    do u know the colours changes?...can u post the important ones pls?:)
  6. Shadman Azad

    Chemistry Doubts: Paper 1 & 2

    in displacement reactions for halogen, is there always a colour change? if yes, it means that we have to memorize all the colours of hologens?:oops:
  7. Shadman Azad

    Chemistry Doubts: Paper 1 & 2

    thanks for explaining. one more pls: Q 28 http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_s07_qp_1.pdf
  8. Shadman Azad

    Chemistry Doubts: Paper 1 & 2

    pls explain Q 25 http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_w04_qp_1.pdf
  9. Shadman Azad

    Chemistry Doubts: Paper 1 & 2

    can anyone please help Q13 of June 04 paper 1 http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_s04_qp_1.pdf
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