Class 9 Exam > Class 9 Questions > One atomic mass unit is equal to weight of -a...
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One atomic mass unit is equal to weight of -
- a)one atom of hydrogen
- b)1/16th of oxygen atom
- c)1/12th of natural carbon atom
- d)1/12th of C-12 isotope of carbon
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
One atomic mass unit is equal to weight of -a)one atom of hydrogen b)1...
Explanation:
Definition:
- An atomic mass unit (amu) is a unit of mass used to express atomic and molecular weights.
- It is defined as 1/12th of the mass of a carbon-12 atom.
Given:
- One atomic mass unit is equal to the weight of:
A. One atom of hydrogen
B. 1/16th of an oxygen atom
C. 1/12th of a natural carbon atom
D. 1/12th of the C-12 isotope of carbon
- To determine which option is correct, we need to understand the definitions and relationships between the given options.
Option A: One atom of hydrogen
- The atomic mass of hydrogen is approximately 1.008 amu, which is not equal to 1 amu.
Option B: 1/16th of an oxygen atom
- The atomic mass of oxygen is approximately 16 amu.
- 1/16th of the atomic mass of oxygen would be approximately 1 amu.
- This means that one atomic mass unit could be equal to 1/16th of an oxygen atom, but it is not the standard definition.
Option C: 1/12th of a natural carbon atom
- The atomic mass of carbon is approximately 12 amu.
- 1/12th of the atomic mass of carbon would be approximately 1 amu.
- This means that one atomic mass unit could be equal to 1/12th of a natural carbon atom, but it is not the standard definition.
Option D: 1/12th of the C-12 isotope of carbon
- The atomic mass of the C-12 isotope of carbon is exactly 12 amu.
- 1/12th of the atomic mass of the C-12 isotope of carbon is exactly 1 amu.
- This matches the standard definition of an atomic mass unit.
Conclusion:
- Based on the definitions and relationships between the given options, the correct answer is D. One atomic mass unit is equal to 1/12th of the C-12 isotope of carbon.
Definition:
- An atomic mass unit (amu) is a unit of mass used to express atomic and molecular weights.
- It is defined as 1/12th of the mass of a carbon-12 atom.
Given:
- One atomic mass unit is equal to the weight of:
A. One atom of hydrogen
B. 1/16th of an oxygen atom
C. 1/12th of a natural carbon atom
D. 1/12th of the C-12 isotope of carbon
- To determine which option is correct, we need to understand the definitions and relationships between the given options.
Option A: One atom of hydrogen
- The atomic mass of hydrogen is approximately 1.008 amu, which is not equal to 1 amu.
Option B: 1/16th of an oxygen atom
- The atomic mass of oxygen is approximately 16 amu.
- 1/16th of the atomic mass of oxygen would be approximately 1 amu.
- This means that one atomic mass unit could be equal to 1/16th of an oxygen atom, but it is not the standard definition.
Option C: 1/12th of a natural carbon atom
- The atomic mass of carbon is approximately 12 amu.
- 1/12th of the atomic mass of carbon would be approximately 1 amu.
- This means that one atomic mass unit could be equal to 1/12th of a natural carbon atom, but it is not the standard definition.
Option D: 1/12th of the C-12 isotope of carbon
- The atomic mass of the C-12 isotope of carbon is exactly 12 amu.
- 1/12th of the atomic mass of the C-12 isotope of carbon is exactly 1 amu.
- This matches the standard definition of an atomic mass unit.
Conclusion:
- Based on the definitions and relationships between the given options, the correct answer is D. One atomic mass unit is equal to 1/12th of the C-12 isotope of carbon.
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Community Answer
One atomic mass unit is equal to weight of -a)one atom of hydrogen b)1...
Option. D . 1/12of C12isotope of carbon
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One atomic mass unit is equal to weight of -a)one atom of hydrogen b)1/16th of oxygen atomc)1/12th of natural carbon atomd)1/12th of C-12 isotope of carbonCorrect answer is option 'D'. Can you explain this answer?
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