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  1. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    whats the answer? marking scheme says C. the first line says the metal is below copper so it will discharge before copper so 45g is impurity. purity=5/50 * 100=10%
  2. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    u are still thinking about atps! we gave it 3 weeks ago :confused:
  3. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    yes you can. just plot the gradient of distance-time graph against time for speed-time graph
  4. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    anyway, whats the answer to the other question. aquatic plant dont die without oxygen. they can produce it themselves but when aquatic plant die bacteria decompose them by aerobic respiration and oxygen decreases.
  5. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    .... but i think i am wrong :(
  6. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    it would be a redox but ammonia's oxidation would not change
  7. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    why? NH3 is alkaline and and H2So4 is acidic they would neutralize each other..... maybe :confused:
  8. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    shouldnt answer be C? marknig scheme says D.
  9. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    i have got it. equation for the reaction is NH3 + H2SO4 = (NH4)2SO4+ H2O. ionic equation for all neutralization reactions= H+ + OH- =H2O. So there is no change in oxidation state of ammonia
  10. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    2005
  11. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    why is the answer A?
  12. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    i got 39/40 :D
  13. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    even after studying bio, i also couldnt remember brown colour of iodine(it is used for starch test) :(
  14. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    how to check if it i more stable? By this series? SO2, NO3, Cl,Br, OH?
  15. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    can salt react with alkali in D to produce salt???
  16. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    i asked this question yesterday and got this answer
  17. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    yes
  18. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    take aqueous as concentrated if it is not mentioned whether it is dilute or concentrated.
  19. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    for concave lens where dotted line and the other ray join, the image is formed there. so the image is diminished
  20. AhsanAfzal

    Biology; Chemistry; Physics: Post your doubts here!

    what? displacement reaction is between more reactive element and lest reactive metal ion in compound.
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