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im frm dammamSame here, Jeddah!
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im frm dammamSame here, Jeddah!
the ans is B-Ca , bcz Al & Zn are soluble & NH4 does not produce pptOne difficult Q (I understand it, I just want to show it to u in case a similar one comes in the exam!):
View attachment 12841
From O level!
The answer is BOne difficult Q (I understand it, I just want to show it to u in case a similar one comes in the exam!):
View attachment 12841
From O level!
Because, the question says wat is NOT present
Right!the ans is B-Ca , bcz Al & Zn are soluble & NH4 does not produce ppt
One difficult Q (I understand it, I just want to show it to u in case a similar one comes in the exam!):
View attachment 12841
From O level!
which years paper?
According to cations tests, they should form white ppt that is sol. in excess!Because, the question says wat is NOT present
and AL3+ and Zn2+ being Amphoteric react with NaOH and no ppt is formed
NH4+ doesnot form a ppt just ammonia is released
the ans is B-Ca , bcz Al & Zn are soluble & NH4 does not produce ppt
I haven't solved nov 09, but i got it from june 2011ITS FROM O LEVELS NOV 09
i didn't get itRight!
First, ammonium ion doesn't form a ppt..i didn't get it
I haven't solved nov 09, but i got it from june 2011
thnx .. got itFirst, ammonium ion doesn't form a ppt..
Second, zinc and aluminium ions are soluble in excess, so they may have formed and then dissolved!
Moreover, the Q says: no ppt was formed because no ppt formed as NaOH WAS ADDED TOO QUICKLY not because of dissolving!
So answer must surely be Ca2+ as its ppt is insol. in excess which did not form as NaOH WAS ADDED TOO QUICKLY!!
O level... http://www.xtremepapers.com/papers/...l O Level/Chemistry (5070)/5070_s11_qp_11.pdfWHICH BOARD ?????
i think you have to take it as ALL Acids, as we are not supposed to have knowledge of the reactivity of different acids...which paper is this from?Hello, guyss pleaaasee aia need some help! how do we know if the specific given acid reacts with the metal or not plzzzzzzzzz
This question came in most of the PP but its not in a direct way if u know what I mean anyway thank youi think you have to take it as ALL Acids, as we are not supposed to have knowledge of the reactivity of different acids...which paper is this from?
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