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Q.

An atom of an element is 40 times heavier than 1/12th  of the mass of C-12 isotope. The atomic mass of the element is

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a

12 U

b

40 U

c

20 U

d

10 U

answer is C.

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Detailed Solution

An atom of an element is 40 times heavier than 112th of the mass of C12  isotope means calcium so its atomic mass is 40 U.
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