AS Chemistry Practical - Paper 34

[Sheikh Nahiyan]

o/n 2011 v31 q2 check this nd plz help me hoe to identify which gases are evolved when v heat fa6...

For gas test, you should do the splint test, then the litmus test. That is what I know! :\

 

[mrnt3250]

Btw, I didn't understand why they chose the cation is Lead (Pb2+), based on the fact that
Na2CO3 & Na2SO4 react with FB6 to give a white ppt!? (Like, anything gives white ppt..)
And then based on reaction of NaOH with FB6, to we didn't test with NH3, so how do we know which metal is used?

heheheheh I just understood my mistake
By the reaction of SO4^2- with Pb^2+ (As in page 9), white PPT is given

 

[sweetjinnah]

Hain Allah! Itne typing mistakes! :|

ohhh plzz typing mistakes mt dekho, u understood gud (is mein typing mistakes nahi hain)

 

[Sheikh Nahiyan]

ohhh plzz typing mistakes mt dekho, u understood gud (is mein typing mistakes nahi hain)

Achha.. Nai dekhta.. Jee. Shukriya..

 

[wild child]

This time two Qs are coming. One will be of titration in which thermometer is used(acid-alkali). And th other Q will be of ions. This is what our sir told us.

 

[Sheikh Nahiyan]

This time two Qs are coming. One will be of titration in which thermometer is used(acid-alkali). And th other Q will be of ions. This is what our sir told us.

Can you please specify the ion tests? :L

 

[wild child]

I can tell that till evening.

 

[Sheikh Nahiyan]

I can tell that till evening.

Ok. Waiting for it

 

[KWIKIW]

I heard that 3 qs are coming.

 

[Sheikh Nahiyan]

I heard that 3 qs are coming.

Ok. Now I am confused :L

Supposedly, 1titration question, 1 enthalpy question and 1ion test question will come i guess

 

[mrnt3250]

I've also heard 3 questions.

 

[Alool]

how will i know which gas is evolved in the experiment?

 

[Sheikh Nahiyan]

how will i know which gas is evolved in the experiment?

You have to do the gas test! if a colorless gas is released, first do a splint test then a litmus test
And if you see that a brown gas is evolved, you can say that it is NO2

 

[Ahmedraza73]

I can tell that till evening.

Please upload the IR and everything that you may know True about chemistry practical 34...Please help needed

 

[Ahmedraza73]

Any guess paper Of Chemistry practical 34 anyone

 

[stareaj]

Pls tell the guess ppr someone plsss

 

[NidaChaudhary]

Ok. Now I am confused :L

Supposedly, 1titration question, 1 enthalpy question and 1ion test question will come i guess

But thats wat came for p33 soooo??? It cant b same i guess...

 

[The_other_guy]

Unless some CIE guy comes and gives away the details, we can't be sure about the reagents to be tested. And frankly, it doesn't even matter if we did, all we need to know are the procedures and we gotta do them anyways. Just google the basic colour changes and keep it in mind. I also heard they will provide with three litmus papers. So I think we need to test for gasses by thermal dec as well. Ad all we can do is google measuring enthral pay change and titration procedures. And guys, YouTube is one hell of resource for the methods, descriptions in full step by step, ******* cool, I say!

 

[mrnt3250]

You have to do the gas test! if a colorless gas is released, first do a splint test then a litmus test
And if you see that a brown gas is evolved, you can say that it is NO2

But be careful not to be fooled, NaBr can also react with H2SO4, producing NahSO4 and HBr, and the HBr again gets oxidized (reducing H2SO4), and producing SO2, and Br2 gas!! (Brown)

 

[mrnt3250]

Unless some CIE guy comes and gives away the details, we can't be sure about the reagents to be tested. And frankly, it doesn't even matter if we did, all we need to know are the procedures and we gotta do them anyways. Just google the basic colour changes and keep it in mind. I also heard they will provide with three litmus papers. So I think we need to test for gasses by thermal dec as well. Ad all we can do is google measuring enthral pay change and titration procedures. And guys, YouTube is one hell of resource for the methods, descriptions in full step by step, ******* cool, I say!

Dude it's Enthalpy