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Identify the species undergoing oxidatio...

Identify the species undergoing oxidation and reduction.
a. `H_(2)S(g)+Cl_(2)(g)rarr2HCl(g)+S(s)`
b. `3Fe_(3)O_(4)(s)+8Al(s)rarr9Fe(s)+4Al_(2)O_(3)(s)`
c. `2Na(s)+H_(2)(g)rarr2NaH(s)`

Text Solution

Verified by Experts

(i) `H_2S` is oxidised because a more electronegative element, chlorine is added to hydrogen (or a more electropositive element hydrogen has been removed from `H_2S` ).
Chlorine has been reduced because hydrogen is added to it .
In terms of electronic concept , we can say,

(ii) Aluminium is oxidised because oxygen is added to it.
Ferrous ferric oxide `(Fe_3O_4)` is reduced because oxygen has been removed from it .
In terms of electronic concept :

(iii) In this case, sodium has been oxidised and hydrogen has been reduced This becomes more clear in terms of electronic concept.

NaH is ionic compound and exists as `Na^(+)H^(-)`.
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