Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
@d!_†oX!©:
I thought perhaps people will have many chem doubts just b4 the exam, so I made this thread...its better if we have all chem question in one thread rather that making new ones for each question.I start:
1)Design and draw an apparatus that could be used to collect the volume of hydrogen produced when zinc is added to dilute hydrochloric acid.
2)A solution gives a white ppt which is soluble in excess with sodium hydroxide. Its reaction with aq. ammonia gives a white ppt which is insoluble in excess. Find out the cation present in the solution.
okay, so i know how to design the experiment(as in the description) but i wanted a neat diagram plss.
nd for the second question, there can be 2 answers- Aluminum and Lead.....so which one should i write??
Ghost Of Highbury:
the first one can be like this (attached)
the second one, umm, i guess it shud be aluminum because lead isnt dere in the book . which past paper is this?
@d!_†oX!©:
Thanks for the diagram aadi...dts wt i wanted...
for the second, its from an o level past paper...actually i have a revision book from o levels...nd the question is from
"N2002 P3 A2a"
that is what is written, bt i tried o level nov 2002 p3..bt dts a practical...i dunno..
see if u know which paper it is nd let me know!!
nid404:
Some1 could draw the stuff for you
For the second part.......Aluminium ions can be distinguished fromlead ions by the insolubility of lead chloride. So U add dil. HCl to the mixture If colorless solution is formed it is aluminium ions. If a white ppt remains, then it's lead
@d!_†oX!©:
but nid my practical paper is over...this question is from the structured paper(p3).....i can't do those reactions in the examination hall :P
Thanks anyways...plss see if u cud help an better
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