Chemistry
Grade-8
Easy
Question
State whether the following statements are correct or incorrect.
(i) The amorphous forms of carbon contain 99 % of carbon.
(ii) The process of gradual conversion of vegetable matter into carbon-rich substances is called carbonization.
(iii) Coal tar is used as a smokeless fuel.
Hint:
i) Diamond has 99% carbon.
ii)Carbonization is the process by which coal is formed.
iii)The product of coal when heated in the absence of air.
The correct answer is:
The correct option is b).
The correct statements are:
i) The crystalline forms of carbon contain 99 % of carbon.
iii) Coke is used as a smokeless fuel.
Atoms form diamond, one of the hardest substances on earth. Carbon occurs naturally as carbon-12, which makes up nearly 99% of the carbon in the universe.
Smokeless fuels do not produce smoke when burned, and the term is commonly used for solid fuels such as anthracite, coke, and charcoal. Coke is therefore a smokeless fuel.
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