Question

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

(a) F > Cl > O > N 

(b) F > O > Cl > N 

(c) Cl > F > O > N 

(d) 0>F>N>CI

Answer 1

(a) F > Cl > O > N

Across a period, the oxidising character increases from left to right. Therefore, among F, O and N, oxidising power decreases in the order: F > O > N. However, within a group, oxidising power decreases from top to bottom. Thus, F is a stronger oxidising agent than Cl. Thus, overall decreasing order of oxidising power is F > Cl > O > N and the choice (a) is correct.