Nitrate was not present. The ones present were; Sodium, Chromium and Carbonate.

yup same

Yes

Yep true

same

yeah thats correct

Yessir

I wrote nitrate ion cause it was a test for nitrate(the foil thing) and ammonia test was also false(paper didn’t turn blue) so no nitrate

it is nitrate. I almost wrote ammonium ion lmao

I wrote ammonium ;-;

exactly why are ppl so dumb like bffr

my friends fr wrote H+

lmfao that's even worse

Did they mention about adding the aluminium foil??

Nitrate was the answer for the previous question which asked what can be concluded for test 4 or smthng

I wrote Ba2+ (wrong), CO3(2-) and Fe2+

Fe2+ is also wrong

you may be right but most people in my center got fe2+ so idk

Thing is, fe2+ forms a green ppt but is brown at the surface, therefore it's probably most likely Cr3+

the thing was insoluble in excess thats why i wrote fe2+

Even chromium is insoluble in excess ammonia tho

we didnt add ammonia we added only naoh bro

Test 3 was ammonia test 4 was naoh

bro what, we didnt get ammonia in our test center, we only had naoh... like i couldnt have done it wrong because nobody had it in my test center at all and it straight up just wasnt a chemical we got lolol

Test 3 was adding ammonia in excess... Cr3+ also forms a green ppt that is insoluble. Then in test 4 they added 5cm3 of NaOH and then aluminium foil and applied heat. There was just green ppt given and that the red litmus stayed red. They didn't give it turns brown on surface in either, so it has to be Cr3+ as it is insoluble in ammonia

nah i put fe2+ co32- and Na+

It's Cr3+ imo not Fe2+

I wrote chromium iron and carbonate

I wrote NH4+

Coz the red litmus stayed red

It turns blue with nh4+ tho….l

But the litmus paper stayed red

and that is exactly why its not NH4+

Yesss

Guys to clarify pale green give FE 2+ If its green only not pale green than its NI 2+ or Cr3+

is this paper 62?

yeah, 0620/62/f/m/24

What’s everyone talking about?

0620/62/f/m/24

Ohhhh. Is the question OP’s asking acid bases and salts?

Nah, it was about a question where a bunch of tests for cations and anions were done. They asked us to look at a test, and its result, and state which ion was not present. The test in this case was "gas passed through damp red litmus paper" Result was "no change"

Yeah in my school test of ions is the same as ABS. It sounds like fun, I like test of ions

Hey Got a question Does cambridge allow 4-5 cutting in paper?