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Total number of neutrons present in 4g o...

Total number of neutrons present in 4g of heavy water `(D_(2)O)` is : (Where `N_(A)` represetns Avogadro's number)

A

`2.4 N_A`

B

`4 N_A`

C

`1.2 N_A`

D

`2 N_A`

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