Chemistry
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.
Answer
Both A and R are true and R is the correct explanation of A.
Explanation — A is true as an increase in the impurities means lesser clarity of diamonds, which reduces their value.
R is true as colourless, transparent diamonds are the costliest as they are used for making gems and various jewellery.
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
Related Questions
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.
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): Pencil leads are made up of graphite.
Reason (R): Graphite leaves a black mark on paper.
- 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): Carbon dioxide is used in fire extinguishers.
Reason (R): CO2 gas is a non supporter of combustion, which cuts off the supply of oxygen to fire.
- 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.