paper 12 chemistry ...

[Ahsan Ausaf Ali]

As far as chemistry is concerned ALKAnes arent oxidised by acidified dichromate, infact they are inert compounds and dont even get oxidised other then combustion and free radical substitutions.......u were confused...actually alkenes are converted to alcohols, this also by reaction with steam at 60atm 350C with H3PO4 catalyst.....

 

[toxicdevil]

there was a question
About gas present in the exhaust of a car engine in a much greater amount than any
other gas?
A carbon dioxide
B carbon monoxide
C nitrogen
D water vapour

What was the question? i.e was it just the gas present in the exhaust (then the answer is C) or gas that is a product of combustion (then the answer is D)

 

[mujtabashahnawaz]

there was a question
About gas present in the exhaust of a car engine in a much greater amount than any
other gas?
A carbon dioxide
B carbon monoxide
C nitrogen
D water vapour

What was the question? i.e was it just the gas present in the exhaust (then the answer is C) or gas that is a product of combustion (then the answer is D)

Q was gas present in exhaust

 

[littlecloud11]

But alcohol could have been primary or secondary!!!!!!!!!!!!!!!

ok, you gave alkane, do you remember that the question said that the organic product reacted with Na to give hydrogen. Do alkanes do tht? =P

 

[egy]

there was a question
About gas present in the exhaust of a car engine in a much greater amount than any
other gas?
A carbon dioxide
B carbon monoxide
C nitrogen
D water vapour

What was the question? i.e was it just the gas present in the exhaust (then the answer is C) or gas that is a product of combustion (then the answer is D)

the poisonous gas present ..... i think so ...

so CARBON MONOXIDE

 

[mujtabashahnawaz]

the poisonous gas present ..... i think so ...

so CARBON MONOXIDE

No they didn't mention poisonous gas

 

[mujtabashahnawaz]

ok, you gave alkane, do you remember that the question said that the organic product reacted with Na to give hydrogen. Do alkanes do tht? =P

Ok u got me, I dnt really remember i had done alkane or alcohol!

 

[egy]

No they didn't mention poisonous gas

i do think that they mentioned it as poisonous gas in the exhaust

 

[littlecloud11]

i do think that they mentioned it as poisonous gas in the exhaust

you mixed up ur questions. There was a question regarding a gas that does not produce poisonous gas when burned. For tht the answer was Hydrogen. and about the car exhaust, they didnt ask for a poisonous gas. It's actually a repeat question frm 2002

 

[mujtabashahnawaz]

you mixed up ur questions. There was a question regarding a gas that does not produce poisonous gas when burned. For tht the answer was Hydrogen. and about the car exhaust, they didnt ask for a poisonous gas. It's actually a repeat question frm 2002

Yeah...agreed

 

[egy]

may be

 

[iceman]

you mixed up ur questions. There was a question regarding a gas that does not produce poisonous gas when burned. For tht the answer was Hydrogen. and about the car exhaust, they didnt ask for a poisonous gas. It's actually a repeat question frm 2002

do u remember the other options for the 'gas that does not produce a poisonous gas when burned' question ???

 

[littlecloud11]

do u remember the other options for the 'gas that does not produce a poisonous gas when burned' question ???

um, there was carbon and sulphur but i dnt remember the othr option.

 

[thunderingthunder]

that was question number 26 and answer was alcohol this was the only question which wasted my 5 to 6 mins.

WHAT a Memory SERIOUSLY!!

 

[Prince III]

do u remember the other options for the 'gas that does not produce a poisonous gas when burned' question ???

Dont Know the options But the answer was hydrogen

 

[Prince III]

This Alcohol and Alkane would led to World War III
Seriously the One who still don't believe it was alcohol just wait to see the marking scheme

 

[Prince III]

And for the car exhaust one as far as I feel the question was which gas produced is most harmful and that's
definitely CO
Also asked from my friends they too all did CO :/

 

[Prince III]

the poisonous gas present ..... i think so ...

so CARBON MONOXIDE

I did CO too
As far as I remember it asked the most harmful gas
Mostly people just ticked N2 because they thought it was a repeated question

But all we can do is just wait for the marking scheme

 

[mujtabashahnawaz]

I did CO too
As far as I remember it asked the most harmful gas
Mostly people just ticked N2 because they thought it was a repeated question

But all we can do is just wait for the marking scheme

Dude they didn't actually mention about any poisonous or harmful thing at all..

 

[littlecloud11]

I did CO too
As far as I remember it asked the most harmful gas
Mostly people just ticked N2 because they thought it was a repeated question

But all we can do is just wait for the marking scheme

No way, http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w02_qp_1.pdf

see question 19. THAT was the ACTUAL question. 'nuff said.