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STD 12 - p -Block elements - ll — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - p -Block elements - ll4 Marks
MCQ
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 $I$ true. but statement $II$ is false.
  • ✓
    Statement $I$ is false but statement $II$ is true.
✓

Answer

Correct option: D.
Statement $I$ is false but statement $II$ is true.
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

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