P1 MCQ's preparation thread for chemistry ONLY!!!!

[h4rriet]

w08 : 1 : 13 and 14 please help i think it's kind of a base knowledge question yet i don't know it help

no 13 : which oxide will produce the most acidic solution with water ?
A-co B-CO2 C-SiO2 D- P2O5

n0 14 : which salt is produced when amonia is added to aqueus sulpher dioxide until jest alkaline ?
A- NH4SO3
B- NH4 SO4
C - (NH4)2SO3
D- (NH4)2SO4

answer to 14 is c why sulphite not sulphate ?!

1. Write a balanced equation and use the mole ratios.
13. The oxides of Period 3 elements get more acidic as you go across the period.
14. Sulphur dioxide in aqueous solution gives sulphite ions, and sulphur trioxide gives sulphate ions.

 

[bogus]

The apparatus shown is used for reflux. Reaction 1 is nucelophilic substition and reaction 2 is oxidation of an alcohol; both these need reflux. The 3rd is the bromine water tes; it occurs at room temperature.

its not reflux its distillation ka apparatus! I 'm sure about that

 

[hope4thebest]

How to answer this q?

 

[KWIKIW]

A benzene molecule is like this:

. The Carbon atom you marked has a double-bond, therefore has only 3 groups attached to it & can't be chiral. It helps to remember that benzene isn't chiral, no matter which Carbon you refer to (they all have double-bonds anyway).

Thanks .
Your explanation was very helpful .

 

[syed1995]

? isnt it should be Xcl5 but thats not there !

5th Group have a valency of 3 or 5

PCl3 and PCl5 the two comman examples. P is a 5th Group element.

 

[KWIKIW]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w05_qp_1.pdf

Do you know how to do Qs 3, 17,20?

And do you know what is a ligand (in qs 17)?

 

[sagystu]

1. Write a balanced equation and use the mole ratios.
13. The oxides of Period 3 elements get more acidic as you go across the period.
14. Sulphur dioxide in aqueous solution gives sulphite ions, and sulphur trioxide gives sulphate ions.

thank uuuu very very very very much

 

[sagystu]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w05_qp_1.pdf

Do you know how to do Qs 3, 17,20?

And do you know what is a ligand (in qs 17)?

3 : answer is b cause it says 2nd ionisation energy is higher than neighbours meaning that the 2nd electron is removed from lower orbital so outer orbital is all removed when only 1 electron is removed the only one with 1 e- in outer most orbital is b

17 . ligand is an ion with lone pair of electron that forms a dative bond .... chlorine ions have outer most shell so it's AG ions ........ not sure of the explanation but ligand definition sure.

20 : cis trans isomer gives 2 isomers , structrural isomers gives 2 more from which one is included in the cis trans so 4-1 = 3 isomers

structural isomers are ccl2ch2 and chcl-chcl , 2nd one is used in cis and trans

hope that helps

 

[ahmed abdulla]

3 : answer is b cause it says 2nd ionisation energy is higher than neighbours meaning that the 2nd electron is removed from lower orbital so outer orbital is all removed when only 1 electron is removed the only one with 1 e- in outer most orbital is b

17 . ligand is an ion with lone pair of electron that forms a dative bond .... chlorine ions have outer most shell so it's AG ions ........ not sure of the explanation but ligand definition sure.

20 : cis trans isomer gives 2 isomers , structrural isomers gives 2 more from which one is included in the cis trans so 4-1 = 3 isomers

structural isomers are ccl2ch2 and chcl-chcl , 2nd one is used in cis and trans

hope that helps

 

[sagystu]

it's not clear tell me the exam and question no

 

[Student12]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s08_qp_1.pdf
Q 1D 2A 6C 15B 26C 31 2/3 are the right options.
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w08_qp_1.pdf
Q 1A 2C 4C 30C

 

[KWIKIW]

3 : answer is b cause it says 2nd ionisation energy is higher than neighbours meaning that the 2nd electron is removed from lower orbital so outer orbital is all removed when only 1 electron is removed the only one with 1 e- in outer most orbital is b

17 . ligand is an ion with lone pair of electron that forms a dative bond .... chlorine ions have outer most shell so it's AG ions ........ not sure of the explanation but ligand definition sure.

20 : cis trans isomer gives 2 isomers , structrural isomers gives 2 more from which one is included in the cis trans so 4-1 = 3 isomers

structural isomers are ccl2ch2 and chcl-chcl , 2nd one is used in cis and trans

hope that helps

Thanks.
It was very helpful.

 

[sagystu]

any body can help me in S09:11 ?

 

[KWIKIW]

3 : answer is b cause it says 2nd ionisation energy is higher than neighbours meaning that the 2nd electron is removed from lower orbital so outer orbital is all removed when only 1 electron is removed the only one with 1 e- in outer most orbital is b

17 . ligand is an ion with lone pair of electron that forms a dative bond .... chlorine ions have outer most shell so it's AG ions ........ not sure of the explanation but ligand definition sure.

20 : cis trans isomer gives 2 isomers , structrural isomers gives 2 more from which one is included in the cis trans so 4-1 = 3 isomers

structural isomers are ccl2ch2 and chcl-chcl , 2nd one is used in cis and trans

hope that helps

I am a bit confused in (3) qs.
(3) Why can't A be the correct answer?
It's difficult for me to choose between A and B.

 

[ahmed abdulla]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w04_qp_1.pdf
q 10 , 12 , 18 & 37 38 any one
h4rriet

 

[KWIKIW]

any body can help me in S09:11 ?

(11) qs says that unreactive gas is produced , so answer can't be A and B because NO and O2 are both reactive.
But N2 is reactive so answer can be either C or D.
But since the reaction is highly exothermic(lot of heat energy given out),so any nitrate products will decompose too, so D is not an answer too, as Al(NO)3 will decompose, so then Al(NO)3 can't be shown as product in equation.
No nitrate products are present as products in C .
So this leaves C as the correct answer.

 

[Student12]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s08_qp_1.pdf
Q 1D 2A 6C 15B 26C 31 2/3 are the right options.
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w08_qp_1.pdf
Q 1A 2C 4C 30C

Anyoneeeee ??

 

[KWIKIW]

Do you know how to do Qs (27),(26) and the (30)?
(26)Difficult to choose between C and D.
(27)Difficult to choose between A and C.
(30)Difficult to choose between C and D.
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s04_qp_1.pdf

 

[h4rriet]

How to answer this q?View attachment 27827

Use p1v1+p2v2=p3v3.

 

[h4rriet]

its not reflux its distillation ka apparatus! I 'm sure about that

The apparatus for distillation and reflux is the same!