MCQ
The radius of the third Bohr orbit for hydrogen atom is ____________.
- A158.7 pm
- B52.9 pm
- C212 pm
- ✓476.1 pm
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$\ce{CO_{(g)} + 1/2O2_{(g)} -> CO2_{(g)}}$, ∆H = y .......(ii)
Then, the heat of formation of CO is:

'A' is ____________.