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Displacement reaction of halogens

1473074463236936771162.jpg why is a not the answer since I got displaced... Thanks
Reply 1
Avatar for alow
alow
19
Read this:

http://www.chemguide.co.uk/inorganic/redox/definitions.html

That's a piss poor question though. Could be written so much more clearly.
Reply 2
Avatar for coconut64
coconut64
OP
16
Original post by alow
Read this:

http://www.chemguide.co.uk/inorganic/redox/definitions.html

That's a piss poor question though. Could be written so much more clearly.


Hi, what a speedy reply! Anyway, I get that an oxidising agent is a species that takes an electron from another species. So, I lost an electron and Cl gains one ...
Reply 3
Avatar for alow
alow
19
Original post by coconut64
Hi, what a speedy reply! Anyway, I get that an oxidising agent is a species that takes an electron from another species. So, I lost an electron and Cl gains one ...


Took me a while to spot this: Read the question really really carefully, look for when they call something Iodide/Iodine or Chlorine/Chloride.

This video goes through the mechanism:

https://www.youtube.com/watch?v=-h9dyda2QQs
Reply 4
Avatar for coconut64
coconut64
OP
16
Original post by alow
Took me a while to spot this: Read the question really really carefully, look for when they call something Iodide/Iodine or Chlorine/Chloride.

This video goes through the mechanism:

https://www.youtube.com/watch?v=-h9dyda2QQs



I have thought about this for a while too, which is why I figured b can't be right as it is the chlorine atom that's reduced, not chloride. But A doesn't refer it as chloride though...
Reply 5
Avatar for alow
alow
19
Original post by coconut64
I have thought about this for a while too, which is why I figured b can't be right as it is the chlorine atom that's reduced, not chloride. But A doesn't refer it as chloride though...


Iodide is oxidised by Chlorine which is why A isn't right.
Reply 6
Avatar for coconut64
coconut64
OP
16
Original post by alow
Iodide is oxidised by Chlorine which is why A isn't right.


That's really sneaky, thanks.
Reply 7
Avatar for alow
alow
19
Original post by coconut64
That's really sneaky, thanks.


Yeah it is. I'm not a fan of whoever wrote that question.
Reply 8
Avatar for coconut64
coconut64
OP
16
Original post by alow
Yeah it is. I'm not a fan of whoever wrote that question.


Yeah, same. A lot of these questions will crop up in the new exam though sadly

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