Did you check www.freeexampapers.com ?also plz post for phy as well as eco........
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Did you check www.freeexampapers.com ?also plz post for phy as well as eco........
iron (ii ) ions in fe0 react with oxygen to form fe2O3 ?which statement about the iron is correct ?
1. iron (ii) ions are oxidised because they gain oxygen
2. iron ( ii) are reduced because they lose oxygen
are oxidsed because they gain oxygen
are reduced because they lose oxygen ?
which one is it, and how to find the answer ?[/quo
The answer is A since the number of oxygen atom increases from FeO to Fe2O3
Already answered that. in other topichttp://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w07_qp_1.pdf
Hey guys...number 33 is supposed to be D...however, isn't plating iron with zinc also a way of preventing rusting?
Thanx!Already answered that. in other topic
Letter D for the first one...Impurity lowers the melting point and raises the boiling point.i have a few doubts... plz answer em asap!
Letter D for the last one too.i have a few doubts... plz answer em asap!
Sorry for that.I'm not doing Physics, hence I replied chem questions only.Fatima18: what about the second one??
The reaction is 2NO + O2 --> 2NO2. If you see, all the chemicals are gases... I only know that NO2 is brown in colour and the rest of the gases are colourless... so how to calculate the amount fr product formed per unit time.....or calculate the usage of product per unit time...???? The question asks for the practical details and procedure...Calculate the amount fr product formed per unit time.....or calculate the usage of product per unit time
ya ofcourse i did!!!!Did you check www.freeexampapers.com ?
thanks anyway!Sorry for that.I'm not doing Physics, hence I replied chem questions only.
it's D, but how??I'm not so sure.. but most probably it's A or D..
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