Biology; Chemistry; Physics: Post your doubts here!

[MustafaMotani]

y won't a gas b made?? wud carbonate not react with Mg?

Simple hai reversible reactions mein jahan per volume of gas kam ho waha forward reaction barh jaega pressure barha ne se
e.g 3H2 + N2 = 2NH3
yaha reactants ka volume 4 hai (3+ 1) aur product ka 2 so increasing pressure would increase forward reaction! agr reactants ka volume kam hota aur product ka ziada hota to forward reaction barhanay k liye pressure reduce karna parta

 

[MustafaMotani]

But O is attached to thefirst and second carbon in option P and so is the same in option q and R !

Dats the part I dont get it ...
I can make up dat explanation for u that its Structural formula is same..

 

[syed1995]

But O is attached to thefirst and second carbon in option P and so is the same in option q and R !

P mein OH kahan bun raha hai !!!

O C kay sath connected hai ... khaali


And Structural Formulae matters .. same nai hona chahiyee
---- H H H H
H= O C C C C ===H
===H H H H

Is not Isomer of

-----H H H H
H== C C C C== H
-----O H H H
-----H

Because structural formulae same hai!

CH2OHCH2CH2CH3

 

[kitecrystal]

do you know the answer.. ?

if its nov01,34,the answe is D,....OH is not considered 2 be together while making molecular formula..this can be explained by the fact that carboxlic acid hane general formula CnH2nO2 or CnH2n+1COOH....

 

[malay]

Q/36
http://www.xtremepapers.com/papers/...l O Level/Chemistry (5070)/5070_w10_qp_11.pdf

 

[kitecrystal]

where did u get this question .. ?? no gas should be made..

Q19...I just altered the question to make my concept clear...........

 

[kitecrystal]

P mein OH kahan bun raha hai !!!

O C kay sath connected hai ... khaali


And Structural Formulae matters .. same nai hona chahiyee
H H H H
H O C C C C H
H H H H

Is not Isomer of

H H H H
H C C C C H
O H H H
H

Because structural formulae same hai!

CH2OHCH2CH2CH3

if its nov01,34,the answe is D,....OH is not considered 2 be together while making molecular formula..this can be explained by the fact that carboxlic acid hane general formula CnH2nO2 or CnH2n+1COOH....​

 

[Dukeofwin]

Q/36
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_w10_qp_11.pdf

Its C because all three have same structure!

 

[syed1995]

if its nov01,34,the answe is D,....OH is not considered 2 be together while making molecular formula..this can be explained by the fact that carboxlic acid hane general formula CnH2nO2 or CnH2n+1COOH....​

isn't it there ? and don't use the formulae CnH2nO2 as i have seen some marking schemes where this has been marked incorrect.

 

[Spidey21]

Q/36
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_w10_qp_11.pdf

B

 

[Dukeofwin]

B

Its C boss!

 

[Translucent231]

Q19...I just altered the question to make my concept clear...........

UFFO can u not see that the question clearly states SULFURIC ACID ....
copp carbonate and h2s04 gives c02
mg and h2s04 will give us H2 thats the answer

 

[Spidey21]

Its C boss!

yup it is...i guess i did not look onto it clearly!!

 

[syed1995]

Part E.

Iodine?

 

[malay]

B

ghalat

 

[MustafaMotani]

Q19...I just altered the question to make my concept clear...........

ans is B .. ?

 

[Translucent231]

Part E.

Iodine?

carbon ...(diamond and graphite yaar )

 

[malay]

Its C because all three have same structure!

kaisay pata chala...to me almost all look da same

 

[MustafaMotani]

Q/36
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_w10_qp_11.pdf

C

 

[kitecrystal]

isn't it there ? and don't use the formulae CnH2nO2 as i have seen some marking schemes where this has been marked incorrect.

in structural formula,arrangement is not considered like whether O and H are together or not,...and the formulae CnH2nO2 can be used to check for an isomer or to check whether the substance is carboxylic acid...