Fewpal
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Considering the elements F, Cl, O and N, the correct order of their chemical reactivity in terms of oxidizing property is: 

(a) F > Cl > O > N 

(b) F > O > Cl > N 

(c) Cl > F > O > N 

(d) O > F > N > Cl 

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The oxidizing character of elements increases from left to right across a period. Thus, we get the decreasing order of oxidizing property as F > O > N. Again, the oxidizing character of elements decreases down a group. Thus, we get F > Cl. However, the oxidizing character of O is more than that of Cl i.e., O > Cl. Hence, the correct order of chemical reactivity of F, Cl, O, and N in terms of their oxidizing property is F > O > Cl > N. 

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