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M : N = 2 : 7 and M : O = 4 : 3, then wh...

M : N = 2 : 7 and M : O = 4 : 3, then what is (M + N) : (N + O)?

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(i) Mn, (ii)Cu, (ii) `Mn^(3+)`, `(E_(M^(+)//Mn^(2+))^(@)= + 1.57V)`
(iv) `Eu^(2+)` due to exactly half filled `f^(7)` configuration and `Yb^(2+)` due to completely filled `f^(14)` configuration (v) `MnO_(4)^(-) +8 H^(+)+ 5e^(-) rarr Mn^(2+) 4H_(2)O)`
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