Question

Given below are two statements :
Statement I : The pentavalent oxide of group-15 element, E2O5, is less acidic than trivalent oxide, E2O3, of the same element.
Statement II : The acidic character of trivalent oxide of group 15 elements, E2O3, 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 true, but Statement II is false
• D. Statement I false, but Statement II is true

Answer 1

Answer: (D)

Statement I false, but Statement II is true

Answer 2

The correct answer is (D) : Statement I false, but Statement II is true.
Statement I is false, as E2O5 is more acidic than E2O3
Statement II is correct.
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 : E2O5 > E2O3 Down the group, acidic character of E2O3 decreases