The graph is of % of Oxides remaning, the question is asking which is most effective at removing the oxides. If 10% remaing then 90% have been removed, this is more effiective then the one that removed 40% and left 60% behind.
Hence it's D.
C - The NH3 is/was used to create explosives (industry), it could be used for farming as a source of nitrogen.
yep, 14/15, me happy clam
but err, why isn't 14 B? thats what i put.
All the big mark questions were the exact ones that i studied for, ie SO2 and NOx one, shipwrecks one, water treatment etc.
what was i so worried 'bout?
hmmmm, me thinks the scaling on chem and phy will go down next year....
music aural turned out to be my hardest exam...
thats the one i thought would be easiest.
but who gives a #$%^? i'm a finished. i can put all this "knowledge in my 'pile of perpetual ignorage', get pissed, and forget 'bout it all for another 6 weeks or so when the UAI's come out....
FREEDOM WILLY, FREEDOM......