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  1. B

    Physics, Chemistry and Biology: Post your doubts here!

    I know you don't need it now, but still
  2. B

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    IGCSE Biology > 2010 > Summer > qp12 > question 16... Please explain.
  3. B

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Whats is the pH of chlorine gas? Is it acidic or alkaline? What is its colour in universal indicator
  4. B

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Please help me here with QUESTION 21 in the attached PDF.
  5. B

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Warrior66, Yeah that helps a lot. Thanks
  6. B

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    It is C. First, you get lead (II) iodide, which is yellow owing to the iodide cations (you need to look up ion tests if you don't know this...) The solution (the solution) consists of barium and nitrate ions. When you add sulfuric acid, barium ions react with sulfate ions to form barium...
  7. B

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    THANK YOU, BUT I REFERRED TO QUESTION 21 NOT QUESTION 22! :p
  8. B

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Please help me with question 21 of the attached PDF.
  9. B

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Please help me with question 21 of the attached PDF.
  10. B

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Guys, found this MCQ paper on xtremepapers forums itself. Contains some predicted questions for our bio/phys/chem MCQs. Although physics is over, lets solve the MCQs for bio and chem, discuss our answers and see if we can solve each other's doubts. Yeah?
  11. B

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    The mark scheme is not original (not published by CIE). Maybe that's why. No point in scratching your head to justify C. I am 100 % sure that its B.
  12. B

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Why does chlorine make the indicator colourless? Its pH is 11.7!
  13. B

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Ya but why is it D and not B?
  14. B

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Its definitely B. I did the same question. Iodide anion always gives yellow colour. If you are solving one of the 1990s papers, the mark scheme shows the wrong answer.
  15. B

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    June 1997 IGCSE Chemistry
  16. B

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Yet again, another doubt. Please help me with question 13 in the PDF attached. Thanks :)
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