How was your Chemistry AS P34

[waspzalachenko]

I got FB3 carbonate,,,,
but what was FB6???

 

[sadman]

its didnt ask the identity for FB6 it was a catalyst and a reducing agent

 

[SMAMN26]

Yes i got the same result for FB6!

 

[SMAMN26]

what was the highest temperature change?

 

[markskoop]

in which A or b reducing agent?
and which one got catalyze?

 

[unknown2011]

but i tested fb 3 with lime water and it didnt return milky! but there was definitely a gas.
the volume i got was 30 cm3 and the temp was around 12.

and didnt fb 3 produce a white ppt with Pb 2+ ? does carbonate do that?

 

[markskoop]

but you just ahv to check the probable one.and den remove the unwanted one...however..jus wanted to ask,in d chemical identification of fb6.which one was catalyst and which reucing agent?? den wht anion did u wrote for fb3?

 

[waspzalachenko]

what was the obsii for FB6?

 

[shressubha]

I got following anions
FA3: Chloride (As it gave white ppt with Pb2+; It also gave white ppt with AgNo3 which was soluble in NH3)
FA4: Chromate
FA5: Bromide

And I think FA6 was Manganate that acted as oxidising agent when added to H202

 

[Emily793]

yeah got that too.. but some are saying it acted as a catalyst! :%)

 

[Banglarbagh]

i reversd the axis es in da grph queston..!! wld i gt any mark........????

 

[Emily793]

you may get none or at most 1.. sorry pal

 

[zenyatales]

I got following anions
FA3: Chloride (As it gave white ppt with Pb2+; It also gave white ppt with AgNo3 which was soluble in NH3)
FA4: Chromate
FA5: Bromide

And I think FA6 was Manganate that acted as oxidising agent when added to H202

but i tested fb 3 with lime water and it didnt return milky! but there was definitely a gas.
the volume i got was 30 cm3 and the temp was around 12.

and didnt fb 3 produce a white ppt with Pb 2+ ? does carbonate do that?

I wrote FA3 as chloride too, but most of everyone say it was carbonate.
It didn't give the lime water test for me too. Tried twice.
Maybe we should have heated it ?? :%)

 

[Emily793]

hey sorry for that did not notice that you put chloride!
yes i do confirm it was carbonate!

 

[unknown2011]

I wrote chloride too. I don't think carbonate gives a white ppt with lead nitrate.

 

[Emily793]

you dont get effervescence with chloride neither! lol guys jst got the info it varies depending on centre both answers are correct!

 

[unknown2011]

I got following anions
FA3: Chloride (As it gave white ppt with Pb2+; It also gave white ppt with AgNo3 which was soluble in NH3)
FA4: Chromate
FA5: Bromide

And I think FA6 was Manganate that acted as oxidising agent when added to H202

FA6 was a reducing agent as H2O2 is an oxidising agent itself. But for the second part I wrote oxidising agent because the green solution was oxidized to red solution. I don't know what I did. Shoot.

 

[SMAMN26]

you dont get effervescence with chloride neither! lol guys jst got the info it varies depending on centre both answers are correct!

are u sure that both answers are correct?

 

[SMAMN26]

and how did u guys find the conc. of H+ ??

 

[shressubha]

hey sorry for that did not notice that you put chloride!
yes i do confirm it was carbonate!

However, I confirmed it as a chloride by using AgNO3 and NH3 and it tested positive :twisted: May be both anions were present as there was efferveresence!!!!!!!!!!!!!!!!!!!!!!!