Question

Given below are two statements :
Statement -I : The pentavalent oxide of group- $15$ element. $E _{2} O _{5}$. is less acidic than trivalent oxide. $E _{2} O _{3}$. of the same element.
Statement -II :The acidic character of trivalent oxide of group $15$ elements. $E _{2} O _{3}$. decreases down the group.
In light of the above statements. choose most appropriate answer from the options given below:

• A. Both statement—I and statement-II are true.
• B. Both statement—I and statement-II are false.
• C. Statement-I is true but statement-II is false.
• D. Statement-I is false but statement-II is true

Answer 1

Answer: (D)

As +ve oxidation state increases, EN of element increases hence acidic character increases. Down the group, non-metallic character decreases, acidic character decreases.
Acidic character : $E _{2} O _{5}> E _{2} O _{3}$
Down the group, acidic character of $E _{2} O _{3}$ decreases