Chemistry
Grade-8
Easy
Question
Match the statements of Column A with those of Column B.
- (i) – (b), (ii) – (d), (iii) – (a), (iv) – (c)
- (i) – (d), (ii) – (b), (iii) – (a), (iv) – (c)
- (i) – (c), (ii) – (a), (iii) – (d), (iv) – (b)
- (i) – (d), (ii) – (a), (iii) – (b), (iv) – (c)
Hint:
i)coal is mainly carbon.
ii) soft coke has less carbon content.
iii)Hard coke is produced when coal is burnt.
iv)Coal tar is dark black and solid.
The correct answer is: (i) – (d), (ii) – (b), (iii) – (a), (iv) – (c)
The correct option is b) (i) – (d), (ii) – (b), (iii) – (a), (iv) – (c).
The carbonization process is a slow process of carbonization of dead plants buried deep in the earth's surface.
Soft coke is obtained by high temperature carbonization. Used as domestic fuel to produce hydrogen gas and acetylene. It is black or greyish and is porous.
Hard coke is used as a fuel and as a reducing agent in the smelting of iron ore in blast furnaces. Hard coke is produced by heating coking coal in the absence of air. This process is called destructive distillation.
Coal tar is a dark colored liquid that is a by-product of the production of coke and coal gas from coal. A type of creosote. It is glossy.
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Which of the substances are not used as a fuel?
The correct option is c)Lignite.
Due to its high volatile content, lignite is more easily converted into gas and liquid petroleum products than high-grade coal. Unfortunately, it has a high moisture content and is prone to spontaneous combustion, which can cause problems during transportation and storage.
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Due to its high volatile content, lignite is more easily converted into gas and liquid petroleum products than high-grade coal. Unfortunately, it has a high moisture content and is prone to spontaneous combustion, which can cause problems during transportation and storage.
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