Answer :

(i)

Explanation: Alloys are solid solutions. Solids in alloys get intermixed with each other such that individually these can’t be recognised. Since the transition metals are similar in sizes therefore get easily settled in the crystal lattice of another metal, hence transition metal form alloys. Example of some alloys are- Brass, Bronze etc.


(ii)


Explanation: Mn2O3 is basic because the oxidation state of Mn is +3 and exist in d4 electronic configuration, Mn can still lose more electron to achieve +7 oxidation state of d0 state. Hence it is basic in nature. On the other side, Mn2O7 is acidic because it already exist in its highest possible oxidation state and has no more electrons left to lose. Therefore Mn2O7 is acidic.


(iii)


Explanation: Europium (Eu) can exist in +2, +3 and +4 oxidation states. +3 oxidation state of Eu is very stable therefore Eu get readily oxidised from Eu+2 to Eu+3 state by losing one more electron and hence it is a strong reducing agent.


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