Chemistry
Grade-8
Easy
Question
Fuels are those substances which:
- Burns in the air to give a large amount of energy
- Burns without oxygen to give a large amount of energy
- Burns in the presence of nitrogen to give a large amount of energy
- All of these
Hint:
Fuels are used in factories, automobiles and even to cook food.
The correct answer is: Burns in the air to give a large amount of energy
The correct option is a)Burns in the air to give a large amount of energy.
Substances that are readily available, burn at a moderate rate in air, and produce large amounts of heat energy without leaving undesirable residues are called fuels. Examples: wood, charcoal, gasoline, petroleum, etc.
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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.
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.
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The huge forest grows around 300 million years ago covering most of the portion of the earth. Due to the extreme pressure of the earth and high temperature, and the absence of air, the vegetation dies and forms X . This X is compressed between sediment layers to form Y. Further compression forms Z and W, eventually anthracites are formed.
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Which of the substances are not used as a fuel?
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