Chemistry MCQ thread...

[workinghard]

itx C rite?!
CO if forms nvr burns in air....

 

[DeathDealer]

Ohhhhhh tch......... thanx Alot

 

[kingmanu]

itx C rite?!
CO if forms nvr burns in air....

but wont it produce CO2

 

[workinghard]

dats wat i caid ... no it ll not form CO2 in atmospher!@

 

[kingmanu]

dats wat i caid ... no it ll not form CO2 in atmospher!@

ohh thnx

 

[DeathDealer]

http://www.xtremepapers.me/CIE/Internat ... 4_qp_1.pdf
.
Ques 9........?

 

[Hateexams93]

how to find this ?

 

[DeathDealer]

Itx Simple.......! Ans C
fo a reaction 2 b Fast or Greatest Yield it mst hav a LOW activation energy n mst b EXOTHERMIC
A n B r Endo so WRONG
C haz Less Activation Energy dn D
so Ans iz C

 

[DeathDealer]

http://www.xtremepapers.me/CIE/Internat ... 4_qp_1.pdf
.
Cn u tell meh About diz Ques ?
don no da Xact Reason !

 

[Hateexams93]

what about highest yeild ?

 

[Hateexams93]

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w04_qp_1.pdf
.
Cn u tell meh About diz Ques ?
don no da Xact Reason !

answer is B ,construct balanced equation and u will see that for B 5 moles of O2 is needed ,more o2 needed , more energy produced i guess

 

[Hateexams93]

and how do we know which one will give the highest yeild ?

 

[kingmanu]

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w04_qp_1.pdf
.
Cn u tell meh About diz Ques ?
don no da Xact Reason !

which question

 

[Hateexams93]

Which statements about the reaction of solid sodium bromide with concentrated sulfuric acid are
correct?
1 Hydrogen bromide is a product of the reaction.
2 Sulfuric acid is oxidised to sulfur dioxide.
3 Bromide ions are reduced to bromine.
WHY 2 AND 3 ARE WRONG ?

 

[usman]

it took me atleat 2o hours (a day and a ni8) in a row to jux browse this thread oMG :crazy:

 

[hassam]

usman ppr bhi dena hay....aur ppr aaj hay kal nae...pr mei so na jana

 

[hassam]

 

[hassam]

 

[mickysharif]

I think the ans of the two above me as D and the next one is C. hope i'm right, best of luck everyone.

 

[Zishi]

B?