Chemistry
Assertion (A): Coal is used as a fuel for domestic purposes and industries.
Reason (R): Coal is an amorphous form of carbon.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Carbon
1 Like
Answer
Both A and R are true but R is not the correct explanation of A.
Explanation — The primary reason coal is used as a fuel is because it is rich in energy due to its high carbon content, which, when burned, releases significant amounts of heat. The amorphous nature of coal isn't the key factor for its use as fuel—its energy content is.
Answered By
1 Like
Related Questions
Fill in the blanks:
(a) …………… is formed when carbon is burnt in a limited supply of air or oxygen.
(b) Carbon monoxide burns in air with a …………… flame to form carbon dioxide.
(c) Carbon monoxide is a product of …………… combustion.
(d) A mixture of 95% oxygen and 5% carbon dioxide is called ……………
(e) Carbon monoxide is used as a …………… in the extraction of pure metals from their corresponding ores.
Assertion (A): Carbon can form a large number of compounds, most of which are studied under organic chemistry.
Reason (R): Carbon atoms can form long chains with each other.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Diamond and graphite are crystalline allotropes of carbon.
Reason (R): Both diamond and graphite are good conductors of electricity and are used as gems.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The value of diamond decreases with an increase in the impurities.
Reason (R): Colourless, transparent diamonds are the costliest.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.