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Biology; Chemistry; Physics: Post your doubts here!

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Solve the question... you'll need this info later ;) when finding the downward force


how do you know that Cl- ions are in a majority?
its like dis.... water will ionise majorly only if an acid is present... so the conc of OH- is very low...
by comparison, Cl- ions will be more than the OH- ions :) so comparitively Cl- is more...
 
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its like dis.... water will ionise majorly only if an acid is present... so the conc of OH- is very low...
by comparison, Cl- ions will be more than the OH- ions :) so comparitively Cl- is more...
not necessarily :unsure: the presence of acid isn't a MUST for water to ionize...
 
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it is the common reason for it... salt cannot ionise the water :)
That's cuz no one's stupid enough to be passing electricity through WATER! :p Hello! I dunno where you are headed with this but i for one, have no idea what the heck is wrong with this question :D
Anyways, sorry for the inconvenience :)
 
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That's cuz no one's stupid enough to be passing electricity through WATER! :p Hello! I dunno where you are headed with this but i for one, have no idea what the heck is wrong with this question :D
Anyways, sorry for the inconvenience :)
i dont think u got wat m saying... :) u dont need 2 pass electricity thru sumthing 2 ionise it...
ur wish ;) i got it though :)
Its ok :)
 
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GetSomeLife...as far as my chem teacher says, wen its not mentioned in the question tht the solution is dil or conc, it is always taken as conc, nd i hav done sufficient practice so im pretty sure of dis
 
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we have all read that unless it is specifically mentioned that sodium chloride is concentrated, we take it to be dilute in which case OH- is discharged, right?
I don't seem to understand what problems are you guys facing in here.
If the solution is concentrated than the Ion other than OH- would be discharged.
If the solution is dilute then always OH- would be discharged.
 
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hey there i wanted to ask how cani get a* in biology chemistry and physics tell me the books and wat should i do for revision i have done the preperation just need to do final touches .. ppppplllllllllxxxxxxxxx helllppp
 
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hey there i wanted to ask how cani get a* in biology chemistry and physics tell me the books and wat should i do for revision i have done the preperation just need to do final touches .. ppppplllllllllxxxxxxxxx helllppp

Well Keep a cool head . And pray 5 times a day . Ask Allah to reward you with A*s . And do your best in the exam .If your done , this is the only thing left to do .

Pray .Pray .Pray!
 
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I don't seem to understand what problems are you guys facing in here.
If the solution is concentrated than the Ion other than OH- would be discharged.
If the solution is dilute then always OH- would be discharged.

There is a rule enacted by the University Of Cambridge :

If the question does not state whether the solution is dilute or concentrated, then we always assume it to be concentrated.

Proof is in the marking scheme . Questions were solutions are not specified as dilute or concentrated are assumed to be concentrated and the respective answers are derived in this manner .
 
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There is a rule enacted by the University Of Cambridge :

If the question does not state whether the solution is dilute or concentrated, then we always assume it to be concentrated.

Proof is in the marking scheme . Questions were solutions are not specified as dilute or concentrated are assumed to be concentrated and the respective answers are derived in this manner .
You told you this? If it's concentrated than that is always written if it's not then We assume it to be dilute.
 
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You told you this? If it's concentrated than that is always written if it's not then We assume it to be dilute.

No . that's what i used to think .But there are answers in the marking scheme , that imply this is wrong .

1. Solve s05 p4 Q3 c)
2. then Read the examiner report
3. Cry for losing a mark :D

I lost a crucial mark because of this point in my mocks .
scourselfc told me that his friend told him that a prominent teacher had taught him this rule .I asked some of the teachers at my school and they said the same ,that this was a very important rule
 
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No . that's what i used to think .But there are answers in the marking scheme , that imply this is wrong .

1. Solve s05 p4 Q3 c)
2. then Read the examiner report
3. Cry for losing a mark :D

I lost a crucial mark because of this point in my mocks .
scourselfc told me that his friend told him that a prominent teacher had taught him this rule .I asked some of the teachers at my school and they said the same ,that this was a very important rule
I'll conform this from Imran Merchant. :) Best Chemistry teacher.
 
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