(i) Why is +2 oxidation state of Mn (25) quite stable, while the same is not true for iron (26)? (ii) What is meant by

### Question Asked by a Student from EXXAMM.com Team

Q 3112691530.     (i) Why is +2 oxidation state of Mn (25) quite
stable, while the same is not true for iron (26)?
(ii) What is meant by dual nature of electrons?
Calculate the energy and wavelength of the
photon emitted by hydrogen atom when
electron makes a transition from n = 2 to
n = 1. Given that the ionisation potential is
13.6 e V . (1 e V = 1.6 xx 10^(-19) J)

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