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chem doubt

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AN10:
M/J 09 chem p1 mcq no. 11...why is the ans C....why it cannot be D ( i get it A and B are not possible but am confused bw C and D)

nid404:
You straight away eliminate A and B as they produce no unreactive gas (N2)
The reaction is as such

3Ba(NO3)2 + heat ? 3BaO + 6NO2 + 3O2

10Al + 3BaO + 6NO2 + 3O2---> Al2O3 + 3BaO+ 3N2

toleen:
I NEED SITES FOR DOWNLOADING PRACTUCE SHEETS OTHER THAN THE PAST PAPERS

toleen:
ANY 1 hELLO

nid404:
You can try past papers of other boards  :-\

or try this link ...it has practice sheets. http://www.a-levelchemistry.co.uk/AQA%20AS%20Chemistry/new%20AS%20Chemistry%20home.htm

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