Question

Assertion: For Group 15 elements, the acidity of pentavalent oxide of is greater than trivalent oxide.

Reason: Down the group acidity Decreases.

(a) Both assertion and reason are true, reason is correct explanation of assertion.

(b) Both assertion and reason are true, but reason is not a correct explanation of assertion.

(c) Assertion is true, but reason is false

(d) Assertion is false, but reason is true

Answer 1

(b) Both assertion and reason are true, but reason is not a correct explanation of assertion.

The oxide in the higher oxidation state of the element is more acidic than that of lower oxidation state. Their acidic character decreases down the group. The oxides of the type E₂0₃ of nitrogen and phosphorus are purely acidic, that of arsenic and antimony amphoteric and those of bismuth predominantly basic.