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The number of neutrons present in 7 gm o...

The number of neutrons present in 7 gm of phosphonium `(PH_4^+)` ion is `[._15^31P, ._1^1H]` :

A

8 `N_A`

B

3.2 `N_A`

C

4 `N_A`

D

5 `N_A`

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