Multiple Choice Question Answer XXXX — task. Science CBSE, Class 9.

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1. 1 u is equal to

2. The atoms of which one of the following elements exist in free state ?

Answer variants:

Nitrogen

$1.6605$ ×

$10^2{^4}$ g

Helium

$1.6605$ ×

$10^-{^2}{^4}$ g

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