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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: (1) Both Statement I and Statement II are true (2) Both Statement I and Statement II are false (3) Statement I true, but Statement II is false (4) Statement I false, but Statement II is true

1. Both Statement I and Statement II are true
2. Both Statement I and Statement II are false
3. Statement I true, but Statement II is false
4. Statement I false, but Statement II is true

Correct answer: Statement I false, but Statement II is true

Solution

Statement I is incorrect because pentavalent oxides like E2O5 are generally more acidic than their trivalent counterparts due to higher oxidation states leading to stronger acidic properties. Statement II is correct as the acidic character of trivalent oxides in group 15 does decrease down the group due to the increasing metallic character of the elements.

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