Redox reactions one those in which oxidation and reduction take place simultaneously. Oxidant can gain electron where as reductant can lose electron easily. The oxidation state of any element can never be in fraction. If oxidation number of any element comes out be in fractionm, it is average oxidation number of that element which is present in different oxidation states.
(i)The oxidation no. of Fe in Fe 3 O 4 is –
Text Solution
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(i)
Sol. Fe 3 O 4 can be written as FeO.Fe 2 O 3 . In FeO, Fe has O.N + 2, In Fe 2 O 3 O.N of Fe = + 3.
(ii)
Sol. 
, N 1 and N 2 has O.N = 0, because they are linked to each other, For N 3 , x + 0 + 0 + 1 = 0 ⇒ x = –1
(iii)
Sol. 5Cl → 5Cl – , Eq. wt. = 
= 35.5
Cl → ClO 3 – , Eq. wt = 
= 7.1
Total Eq. wt. of Cl 2 = 35.5 + 7.1 = 42.6
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