Physics, Chemistry and Biology: Post your doubts here!

[Adeen Atif]

Only these two answers are different for me.
Or else all your and my answers match

 

[Osman Kaleem]

The answer for 2a is: Filter the solution
Wash with distilled water
Dry in Oven

Thnx

 

[Osman Kaleem]

di) is: The solids are dissolved
Then solid silver nitrate diffuses faster than solid ammonium dichromate due to lower Mr.
Then these two salts react together to form silver dichromate(the red solid) at point S

Thnx eeally appreciate it

 

[Adeen Atif]

Thnx eeally appreciate it

No problem,Happy to help!

 

[Adeen Atif]

How was your exam guys?

 

[Ayesha Asif333]

How was your exam guys?

It was good
How was yours?

 

[Ayesha Asif333]

Who's giving bio p41?

 

[Adeen Atif]

It was good
How was yours?

Mine was also good alhumdulillah

 

[Adeen Atif]

Who's giving bio p41?

Im not gonna give

 

[Adeen Atif]

Lets discuss today,s paper
0620 V1 Chemistry

 

[Ayesha Asif333]

Mine was also good alhumdulillah

Alhamdulillah

 

[Ayesha Asif333]

Lets discuss today,s paper
0620 V1 Chemistry

Sure, what did u write in the suitable exp conditions for the last ques

 

[Ayesha Asif333]

Im not gonna give

R u planning to take bio or no?

 

[ForeverAnonymous]

Hi there, can someone please explain why the answer to this MCQ is C?

Butanedioic acid occurs in amber, algae, lichens, sugar cane and beets. It may be synthesised in two steps from 1,2-dibromoethane.
BrCH2CH2Br ----> X ----> HO2CCH2CH2CO2H
Which reagents could be used for this synthesis?
step 1 step 2
A HCN(g) HCl(aq)
B HCO2Na(aq) HCl(aq)
C KCN(aq/alcoholic) H2SO4(aq)
D NaOH(aq) K2Cr2O7 /H2SO4(aq)
Thanks in advance!

 

[Adeen Atif]

R u planning to take bio or no?

Nope,i got choice between ICT and Bio and I chose ICT

 

[Adeen Atif]

Sure, what did u write in the suitable exp conditions for the last ques[/QUOTEdid

Sure, what did u write in the suitable exp conditions for the last ques

I wrote sulfuric acid and (250 degree celcius which I know is wrong) We didnt study any conditions for esterfication did we?
What did you write?

 

[Adeen Atif]

What name and structure did you drew for the 2nd member of alkene group
And how many marks was this question?

 

[Osman Kaleem]

I wrote sulfuric acid and (250 degree celcius which I know is wrong) We didnt study any conditions for esterfication did we?
What did you write?

If u r from pises then it was clearly written in our book that it is concentrated sulfuric acid

 

[Osman Kaleem]

What name and structure did you drew for the 2nd member of alkene group
And how many marks was this question?

It was propene and structure was simple CH3-CH-CH2 and it was of two marks

 

[Adeen Atif]

If u r from pises then it was clearly written in our book that it is concentrated sulfuric acid

Im talking about temperature here.
And btw Im not from pises