Assertion: The Relative Atomic mass of aluminium is 27
Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of the C – 12 atom.,

A and R are correct, R explains the A.

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A is correct, R is wrong.

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A and R are correct, R doesn’t explain A.

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A is wrong, R is correct.

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Solution

The correct option is A A and R are correct, R explains the A.
Relative atomic mass of an element is the ratio between the average mass of its isotopes to

$\frac{1}{12} t h$ part of the mass of a carbon-12 atom. It is denoted as Ar. It is otherwise called “Standard Atomic Weight”.

If the relative atomic mass of Aluminium is 27 it means that aluminium is 27 times heavier than 1/12th of the mass of the C – 12 atom.,

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(a)

1

(b)

4

= 27) ?

(c)

10

(N a_{2} S O_{3}) ?

Assertion (A) : Atomic mass of aluminum is 27.
Reason (R) : An atom of aluminum is 27 times heavier than 1/12 th of the mass of the C – 12 atom.

\frac{1}{12^{t h}}

What is the mass of 4 moles of aluminium atoms (Atomic mass of aluminium = 27)

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