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  1. R

    Chemistry doubt(Urgent)-(0620)

    Can some one explain this for me, ASAP, THANK YOU (:
  2. R

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

    Listen, so it's C because NO3- are tested by Aluminum foil and Sodium Hydorxide. Addin only the NaOH will not be efficient to test for NO3-. And since in the first exp. the litmus pp was unchanged that eliminated NH4+. But when the Al foil - which is the powdered metal- is added, ammonia gas is...
  3. R

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

    (1)- june 2000- when any metal reacts with steam, the products are always the metal hydroxide and hydrogen gas. So , eliminate answers C and D. From A and B, only iron is more reactive than Hydrogen thus it's the only metal here that can displace hydrogen from steam. Copper is less reactive...
  4. R

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

    nah don't worry about it, and you're most welcome :)
  5. R

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    ohh yea because it's a group one element. Thanks ( :
  6. R

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

    the metal must be less reactive than Hydrogen or else the acid will react with the metal meaning that hydrogen will be displaced by this reactive metal. So you must choose a less reactive metal, less reactive than hydrogen. Only copper is less reactive than hydrogen thus copper will not react...
  7. R

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

    22-you must make hydarted crystals thus, you first need to filter off your solution and keep the residue which are the crystals. Then you will repeat the procedure of adding CuO to the acid as to concentrate the crystals. Then you will filter off again and will then wash the crystals. You cannot...
  8. R

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Could any of you help me with this question. (chemistry) The correct answer is C but why cannot it be A? year november 1999 Thanks (:
  9. R

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

    Any help with this question? I answered A yet the correct answer is C. The paper is November 2000
  10. R

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

    yea great , thanks a BUNCH (:
  11. R

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

    The answer is C, could you please explain it further, I am really confused. As the tip is cut off, the auxin secretion is prevented and that was why I answered A but the thing is , there is no light source mentioned in the question so based on what do we choose which tropism behavior the plant...
  12. R

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

    I ha I've asked this question and I still don't get it. It's from 2001
  13. R

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

    One X chr.
  14. R

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

    This one too, pleassseeee.
  15. R

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

    D?!
  16. R

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

    can someone answer this question please.
  17. R

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

    can anyone please pretty please give me the biology and chemistry papers of 2000 and 2001 summer and winter :( ?
  18. R

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

  19. R

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

    I don't get why?? I answered galvanising :/
  20. R

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

    yes Q.12 Oh okay then Thanks again !!
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