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    (Original post by Aimen.)
    I know it's too late but could someone please help me with this? :3
    Attachment 554587
    Why is it not B?
    Sulfuric acid is a diprotic acid so you might think that it will dissociate twice to give 1 moldm^-3.
    However, second dissociation is weak, so not all of HSO4^- will dissociate.
    So you need a MONOPROTIC strong acid. eg: HCl, HNO3 to give 1 moldm^-3
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    chem. KO
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    (Original post by 12103763d)
    chem. KO
    the paper was oky, no tricky questions
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    I found the paper a bit difficult especially those structures :/
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    I think it's relatively easier compared to the ones in the past few years
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    (Original post by skeletonboy1)
    I think it's relatively easier compared to the ones in the past few years
    Same here, what you got for the masses of fe2+ and fe3+? I think I screwed up that one...
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    What do u think will be threshold for A*
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    What was the type of reaction in the very last part of the paper?? Was it a ligand exchange??!
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    (Original post by majidabdul)
    What do u think will be threshold for A*
    70-75 most probably
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    Yup, around 75 for an A* I guess
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    I had trouble with mcqs
    And i wrote ligand exchange too:confused:
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    Question is straightforward, but it just needs more time to write the answer, like those drawing structures...
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    In mcq, cobalt is catalyst ?
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    (Original post by 12103763d)
    In mcq, cobalt is catalyst ?
    Yeah because it oxidised and then reduced.
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    (Original post by Fone321)
    What was the type of reaction in the very last part of the paper?? Was it a ligand exchange??!
    Well i wrote nucleophilic addition because iron in the reactants was in Fe+2 ion form. Was it a hydrated ion?
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    (Original post by AKucukuncular)
    Well i wrote nucleophilic addition because iron in the reactants was in Fe+2 ion form. Was it a hydrated ion?
    I thought it was in [Fe(H20)6]2+ form so I swapped out the ligands with 6 CN- and wrote it as ligand exchange.
    The answer for the next part is +1 yeah?
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    What was the type of reaction in the very last part of the paper?? Was it a ligand exchange?!
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    Guys that paper gave mixed feelings but look on the bright side! I AM NEVER GOING TO HAVE TO EVEN SLEEP IN THE DIRECTION OF CHEMISTRY AGAIN!
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    (Original post by RizK)
    I thought it was in [Fe(H20)6]2+ form so I swapped out the ligands with 6 CN- and wrote it as ligand exchange.
    The answer for the next part is +1 yeah?
    I wrote +3 because it was a salt of Fe+3, the Fe in bold, with the anion containing Fe itself.
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    The last question, The oxidation number of fe I wrote is +3...
 
 
 
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