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Chemistry Paper 33 Purity% answer of CaCO3 and what were the metal and anions

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The anion is I- and Cl- for sure.
The supervisor in our school got 75 percent in purity.
I got 91.3 percent.
BUT...The truth is that caco3 is pure!!!
 
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I got 70.something% purity
But that was mainly due to the low titration values: I think that CaCO3 was from an old stock, not a fresh one...
 
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I did my practical exam in pencil! Would it make any difference?
Yes, very much: the examiners don't accept answers in pencil!
Out of curiosity: why did you do your paper in pencil? You could have just asked for a pen from the invigilator, they can't penalise you for that.
 
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Mine was almost 75%. And the ions were I and Cl. Transition metal was Mn. Anyone remember the two oxidation states of Mn?
 
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Yes, very much: the examiners don't accept answers in pencil!
Out of curiosity: why did you do your paper in pencil? You could have just asked for a pen from the invigilator, they can't penalise you for that.
even if i did a table in pencil? :O
 
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abt iodine is any1 sure coz i was gettin cream ppt n not only me some of ma frnds were also gettin da same
 
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