Chemistry
Grade-8
Easy
Question
Which of the following forms of carbon occur in nature?
- Charcoal
- Gas carbon
- Wood charcoal
- Coal
Hint:
Its combustion in the absence of air gives coke, coal tar and coal gas as products.
The correct answer is: Coal
The correct option is d)Coal.
Coal is a fossil fuel or a fuel derived from prehistoric plant and animal remains. Coal is formed over millions of years through a process called carbonization. In this process, dead vegetation is transformed into carbon-rich char under very high temperatures and pressures.
Related Questions to study
Chemistry
Fuels are those substances which:
Fuels are those substances which:
ChemistryGrade-8
Chemistry
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.
(iii) Coal tar is used as a smokeless fuel.
ChemistryGrade-8
Chemistry
Read the following paragraph carefully.
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.
Identify the compounds W, X, Y and Z in the above paragraph:
Read the following paragraph carefully.
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.
Identify the compounds W, X, Y and Z in the above paragraph:
ChemistryGrade-8
Chemistry
Match the statements of Column A with those of Column B.
Match the statements of Column A with those of Column B.
ChemistryGrade-8
Chemistry
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.
Which of the substances are not used as a fuel?
ChemistryGrade-8
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.
Chemistry
The amorphous form of carbon contains the impurities like sulphur, nitrogen, hydrogen and ____
The amorphous form of carbon contains the impurities like sulphur, nitrogen, hydrogen and ____
ChemistryGrade-8
Chemistry
Which of the following products does not contain coal tar as an ingredient in it?
Which of the following products does not contain coal tar as an ingredient in it?
ChemistryGrade-8
Chemistry
The carbon content in the coke is:
The carbon content in the coke is:
ChemistryGrade-8
Chemistry
Which of the following form is the most popular variety of coal?
Which of the following form is the most popular variety of coal?
ChemistryGrade-8
Chemistry
Write the descending order of different forms of coals based on the percentage of carbon present in it.
Write the descending order of different forms of coals based on the percentage of carbon present in it.
ChemistryGrade-8
Chemistry
Identify the correct statement from the following:
Identify the correct statement from the following:
ChemistryGrade-8
Chemistry
Which of the following statements is incorrect?
Which of the following statements is incorrect?
ChemistryGrade-8
Chemistry
The nature and the smell of coal tar are:
The nature and the smell of coal tar are:
ChemistryGrade-8
Chemistry
Crystalline and _____ are the two major allotropes of carbon.
Crystalline and _____ are the two major allotropes of carbon.
ChemistryGrade-8
Chemistry
Complete the following analogy:
Lignite: Soft coal :: Anthracite:
Complete the following analogy:
Lignite: Soft coal :: Anthracite:
ChemistryGrade-8
