Biology; Chemistry; Physics: Post your doubts here!

[daredevil]

wat r the catalysts that r used in cracking of hydrocarbons?specially the ones used in the apparatus where there is this tube in which there is a cotton plug soaked in hydrocarbon oil leading to a tube that hv a catalyst nd then ethene is collected abv a water tank in a test tube.

for cracking aluminium oxide or silicon oxide are used as catalysts... correct me if i'm wrong!

 

[daredevil]

Link please.

Btw, have some doubt on the "test of sulphate"

for test of sulphate... add dilute nitric acid then add barium nitrate. white precipitate is observed of barium sulphate.

 

[daredevil]

What Catalysts are used for what processes ?

Vanadium V Oxide for Contact Process
Iron For Haber
Nickel For Hydrogenation
Esterification: Conc. H2SO4
Fermentation: Yeast ..
Hydrolysis: NaOH
And ... ?

Phosphoric Acid for the hydration of ethene
K2Cr2O7 (or any other oxidising agent) for oxidation of alcohol to carboxylic acid
Aluminium Oxide or Silicon Oxide for Craking Process

 

[khizer shahab]

if in electrlysis question it is stated Aq . cuso4

so would be supposing it dilute or concentrated ..?

 

[syed1995]

November 2003 Q10 (g) Why?? can somebody please explain ..

 

[ashiqbal]

I've been through most of the past papers and it's always concentrated! Even one of the guys here, who i think knows Chem pretty well, says the same. ashiqbal

OH stop it YOU!

 

[syed1995]

OH stop it YOU!

How did the paper go ? mine went awesome .. Thank god there was nothing involved about that conc. dil. confusion xD

 

[ashiqbal]

How did the paper go ? mine went awesome .. Thank god there was nothing involved about that conc. dil. confusion xD

Easy paper! went realy well. Though we are not allowed to discuss it here!

 

[syed1995]

Easy paper! went realy well. Though we are not allowed to discuss it here!

haha then let's discuss somewhere else xD.

 

[ashiqbal]

haha then let's discuss somewhere else xD.

Sshhh!!! salman dantay ga!

 

[Doosh Bag]

If we write K2Cr2O7 instead and forget the 'acidified', is it possible to get the marks..

 

[Mayedah]

If we write K2Cr2O7 instead and forget the 'acidified', is it possible to get the marks..

They said name it !

 

[Doosh Bag]

Oh they'll accept this. They have done so in the past papers.

 

[syed1995]

If we write K2Cr2O7 instead and forget the 'acidified', is it possible to get the marks..

so what will we write for that? Acidified Potassium Dichromate(VI) .. ?

 

[Doosh Bag]

Listen, I just want to know if we don't write acidified - will we get the mark ?

 

[Mayedah]

Listen, I just want to know if we don't write acidified - will we get the mark ?

Duuh u will ! It was written in mark scheme tht no difference

 

[SalmanPakRocks]

Listen, No paper discussion on here.

 

[Mayedah]

Listen, No paper discussion on here.

Was jst telling ..ok

 

[SalmanPakRocks]

Was jst telling ..ok

I meant it for everyone.

 

[ISFSAT]

How did the paper go ? mine went awesome .. Thank god there was nothing involved about that conc. dil. confusion xD

it went awesome Alhamdulliah ...it was easy..