Qualification > Sciences

ALL CIE CHEMISTRY DOUBTS HERE !!

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Dania:
The answer is B. Why?

Deadly_king:

--- Quote from: Danii on October 08, 2010, 10:04:34 am ---The answer is D.
Why?

--- End quote ---
Since it is unreactive to mild oxidising agents, the compound should have been a tertiary alcohol before dehydration. Only D offers this possibility.

NOTE : Tertiary alcohols cannot be oxidised.

ashish:

--- Quote from: Danii on October 08, 2010, 11:17:00 am ---The answer is B. Why?

--- End quote ---

CaCO3(limestone)  -----> CaO + CO2

from equation 1 mole CaCO3 produced 1 mole CO2


Mr CaCO3 =100.1

Mr CaO=56.1

Mr CO2=44

1000mt CaCO3 will give 560.1mt Cao and 440mt CO2
200mt  CaCO3 will give 112.02mt Cao and 88mt CO2

mt=million tonnes

total CO2 = 440+88
=528 --- near to 527

IS that CIE i never worked out such question before
i am not sure whether the method is good or not

Dania:
Ah, yes. I think I didn't read the question properly, I get it now. Yeah, it's a CIE paper question.

Deadly_king:

--- Quote from: ashish on October 08, 2010, 02:02:59 pm ---CaCO3(limestone)  -----> CaO + CO2

from equation 1 mole CaCO3 produced 1 mole CO2


Mr CaCO3 =100.1

Mr CaO=56.1

Mr CO2=44

1000mt CaCO3 will give 560.1mt Cao and 440mt CO2
200mt  CaCO3 will give 112.02mt Cao and 88mt CO2

mt=million tonnes

total CO2 = 440+88
=528 --- near to 527

IS that CIE i never worked out such question before
i am not sure whether the method is good or not

--- End quote ---

Good job pal........though it was a bit long  ;)

+ rep

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