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Assertion : One atomic mass unit is defi...

Assertion : One atomic mass unit is defined as one twelfth of the mass of one C-12 atom.
Reason : C-12 is the least abundant isotope of carbon and has been choosen as the standard.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given question, we will break it down into two parts: the assertion and the reason. ### Step 1: Understanding the Assertion The assertion states that "One atomic mass unit is defined as one twelfth of the mass of one C-12 atom." - **Explanation**: The atomic mass unit (amu) is indeed defined as 1/12th the mass of a carbon-12 (C-12) atom. This definition is widely accepted in chemistry and is used as a standard for measuring atomic masses of all elements. ### Step 2: Understanding the Reason The reason provided is "C-12 is the least abundant isotope of carbon and has been chosen as the standard." - **Explanation**: This statement is incorrect. C-12 is not the least abundant isotope of carbon; in fact, it is the most abundant isotope, making up about 98.9% of naturally occurring carbon. The reason C-12 was chosen as the standard for atomic mass is due to its abundance and stability, not because it is the least abundant. ### Conclusion - **Assertion**: True - **Reason**: False Thus, the assertion is true while the reason is false. ### Final Answer The assertion is true, but the reason is false. ---
To analyze the given question, we will break it down into two parts: the assertion and the reason. ### Step 1: Understanding the Assertion The assertion states that "One atomic mass unit is defined as one twelfth of the mass of one C-12 atom." - **Explanation**: The atomic mass unit (amu) is indeed defined as 1/12th the mass of a carbon-12 (C-12) atom. This definition is widely accepted in chemistry and is used as a standard for measuring atomic masses of all elements. ### Step 2: Understanding the Reason ...
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Explore conceptually related problems

Assertion(A) One atomic mass unit is defined as one twelth of the mass of one carbon-12 atom. Reason(R) Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as standard.

One atomic mass unit in kilogram is:

1 amu = (1)/(12) the mass of one C-12 atom .

One atom mass unit (amu) is equivalent to