Biology; Chemistry; Physics: Post your doubts here!

[chum1234]

How was chemistry paper 6 you guys ???? I found it kind of easy surprisingly

 

[Syed Mustafa.1.1]

4 marks gone uptil now.. :/

 

[Syed Mustafa.1.1]

What was the ans of that Test tube one's MCQ?
it had numbers in options... 1 2 3 4 ???

 

[muaz_ali]

I think i already said that if final twmp. is 90 how is it not possible, 90*C does not exceed boiling point of water , read the whole question not just the marking scheme GENIUS

bhai dafa kr ab.
paper kesa hua? and can you relate the answers of the questions you remember.

 

[muaz_ali]

What was the ans of that Test tube one's MCQ?
it had numbers in options... 1 2 3 4 ???

can you recall more details about question?

 

[Umna.Asim]

I don't think we're allowed to discuss the paper the very same day

 

[Alpha Destro]

AWESOME , 99% correct , but i think i lost 1 mark in the ester diagram

 

[Alpha Destro]

What was the ans of that Test tube one's MCQ?
it had numbers in options... 1 2 3 4 ???

It was 2 , the second and the third testube

 

[Haris Zulfiqar]

It was 2 , the second and the third testube

It was 3 , 1st 3rd 4th test tube

AWESOME , 99% correct , but i think i lost 1 mark in the ester diagram

which ester diagram we have to make structure only

 

[Haris Zulfiqar]

I wrote 1st titration vol 25.3 as it was 25.2 which slightly changed my answer of average further my answers to part a b c were change
for example
.000506 mol but i wrote .000507
how much max i will be penalised plzzzz help

 

[Alpha Destro]

It was 3 , 1st 3rd 4th test tube

which ester diagram we have to make structure only

There was no reaction in the 1st and 4th test tube, as there was a copper rod in a solution of mg ions in 1st test tube, dont remember the fourth but pretty sure there was no reaction

*diagram my bad

 

[Alpha Destro]

I wrote 1st titration vol 25.3 as it was 25.2 which slightly changed my answer of average further my answers to part a b c were change
for example
.000506 mol but i wrote .000507
how much max i will be penalised plzzzz help

in the mark schemes they require prescise anwers , as for the titration vol i think if you mess up one volume they consider it all wrong .

 

[muaz_ali]

There was no reaction in the 1st and 4th test tube, as there was a copper rod in a solution of mg ions in 1st test tube, dont remember the fourth but pretty sure there was no reaction

*diagram my bad

yes, of course there was a reaction in 4th. As far as I can remember, there was magnesium rod dipped in Cu2+ solution. I triple checked. 3 was the right answer.

 

[muaz_ali]

mass of CaCO3 used was 1.8 g, percentage of iron was 8.7% in mixture, titration average volume was 25.3. Magnesium Ribbon was silvery white. Emprical formula was C3H8O. Molecular formula was C3H7OH. And ester was propyl prponate. anything more?

 

[Haris Zulfiqar]

in the mark schemes they require prescise anwers , as for the titration vol i think if you mess up one volume they consider it all wrong .

I am saved, by this i only lost appx. 2 marks in whole paper

yes, of course there was a reaction in 4th. As far as I can remember, there was magnesium rod dipped in Cu2+ solution. I triple checked. 3 was the right answer.

You are right i also did this, only 2nd reaction was not feasible

 

[Haris Zulfiqar]

What was the answer of colour change in titration question

 

[muaz_ali]

I am saved, by this i only lost appx. 2 marks in whole paper

You are right i also did this, only 2nd reaction was not feasible

and for the very same reason, I wrote 0.0005 only,

 

[Alpha Destro]

What was the answer of colour change in titration question

green to pink im sure of it

mass of CaCO3 used was 1.8 g, percentage of iron was 8.7% in mixture, titration average volume was 25.3. Magnesium Ribbon was silvery white. Emprical formula was C3H8O. Molecular formula was C3H7OH. And ester was propyl prponate. anything more?

Damn! i wrote the same thing for the empirical formula and the molecular formula : C3H7OH is it wrong ?

 

[Qasim Hafeez]

In titration ques, the 1st and 3rd readings were to ticked?

 

[chum1234]

AWESOME , 99% correct , but i think i lost 1 mark in the ester diagram

which paper ? 32 ??