CIE Chemistry Paper-1: Specimen Questions 81 - 83 of 99
Question number: 81
Which of this structure does not represent an allotropic form of carbon?
In the above figures Fig A represents Diamond, fig B represents Graphite, Fig C represents fullerenes. Fig D represents coal which is not an allotropic form of carbon.
Question number: 82
What is the chemical formula for plaster of paris?
|d.||Question does not provide sufficient data or is vague|
The chemical name of plaster of paris is Calcium sulphate hemi hydrate.
It is prepared by heating gypsum at 100 degree Celsius in rotary kilns, where it gets partially dehydrated.
Question number: 83
Which of the following structure represents alcohol?
|c.||All of the above|
|d.||None of the above|
Alcohols are organic compounds consisting of hydroxyl group –OH attached to a carbon atom.
Choice B shows the structure of ethanol. Ethanol is the type of alcohol found in alcoholic drinks such as wine and beer. It is also useful as a fuel. For use in cars and other vehicles, it is usually mixed with petrol.