Class 9 Exam > Class 9 Questions > Direction : In the following questions, a st...
Start Learning for Free
Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Atomic mass of aluminium is 27.
Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.
- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Direction : In the following questions, a statement of assertion (A) ...
Because atomic mass shows how many times an atom of that element is heavier than 1/12th of the mass of C-12 atom.
Free Test
FREE
| Start Free Test |
Community Answer
Direction : In the following questions, a statement of assertion (A) ...
Assertion: Atomic mass of aluminium is 27.
Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.
Explanation:
The statement of assertion states that the atomic mass of aluminium is 27. This means that the average mass of an aluminium atom is 27 atomic mass units (amu).
The reason given states that an atom of aluminium is 27 times heavier than 1/12th of the mass of a carbon-12 atom. This refers to the concept of atomic mass and the use of the carbon-12 atom as a reference point.
Atomic Mass:
Atomic mass is the mass of an atom, which is measured in atomic mass units (amu). It is determined by adding the number of protons and neutrons in the nucleus of an atom. The atomic mass is given as a relative value compared to the mass of a carbon-12 atom.
Carbon-12 Atom:
The carbon-12 atom is used as a reference point for atomic mass. It is defined as having a mass of exactly 12 amu. This means that 1/12th of the mass of a carbon-12 atom is equal to 1 amu.
Explanation of Assertion and Reason:
The atomic mass of aluminium is 27, which means that the average mass of an aluminium atom is 27 amu. The reason states that an aluminium atom is 27 times heavier than 1/12th of the mass of a carbon-12 atom. Since 1/12th of the mass of a carbon-12 atom is equal to 1 amu, it can be inferred that an aluminium atom is indeed 27 times heavier than 1 amu. Therefore, both the assertion and the reason are true.
Correct Answer:
Option A: Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.
Explanation:
The statement of assertion states that the atomic mass of aluminium is 27. This means that the average mass of an aluminium atom is 27 atomic mass units (amu).
The reason given states that an atom of aluminium is 27 times heavier than 1/12th of the mass of a carbon-12 atom. This refers to the concept of atomic mass and the use of the carbon-12 atom as a reference point.
Atomic Mass:
Atomic mass is the mass of an atom, which is measured in atomic mass units (amu). It is determined by adding the number of protons and neutrons in the nucleus of an atom. The atomic mass is given as a relative value compared to the mass of a carbon-12 atom.
Carbon-12 Atom:
The carbon-12 atom is used as a reference point for atomic mass. It is defined as having a mass of exactly 12 amu. This means that 1/12th of the mass of a carbon-12 atom is equal to 1 amu.
Explanation of Assertion and Reason:
The atomic mass of aluminium is 27, which means that the average mass of an aluminium atom is 27 amu. The reason states that an aluminium atom is 27 times heavier than 1/12th of the mass of a carbon-12 atom. Since 1/12th of the mass of a carbon-12 atom is equal to 1 amu, it can be inferred that an aluminium atom is indeed 27 times heavier than 1 amu. Therefore, both the assertion and the reason are true.
Correct Answer:
Option A: Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
|
Explore Courses for Class 9 exam
|
|
Similar Class 9 Doubts
Top Courses for Class 9View all
Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer?
Question Description
Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer?.
Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 9.
Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free.
Here you can find the meaning of Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer?, a detailed solution for Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Atomic mass of aluminium is 27.Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 9 tests.
|
|
Explore Courses for Class 9 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup