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Which of the following reactioins yield ...

Which of the following reactioins yield elementary gases like `N_(2), H_(2), O_(2)` as the byproducts?
I) `2NH_(3) +2Na to `
II) `8NH_(3)+3Cl_(2) to `
III) `2Pb (NO_(3))_(2) overset(Delta)to `

A

I and II only

B

II and III only

C

I and III only

D

All of these

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