P-Block Elements Ques 567
Question: For $ H_3PO_3 $ and $ H_3PO_4 $ , the correct choice is
Options:
A) $ H_3PO_3 $ is dibasic and reducing
B) $ H_3PO_4 $ is diabasic and non-reducing
C) $ H_3PO_4 $ is tribasic and reducing
D) $ H_3PO_4 $ is tribasic and non-reducing
Show Answer
Answer:
Correct Answer: A
Solution:
The structure of $ H_3PO_3 $ is as given below. There are only two $ -OH $ groups and hence it is dibasic. The oxidation number of P in this acid is +3, whereas P may have +5 oxidation state also. Therefore, $ H_3PO_3 $ can be oxidised which means $ H_3PO_3 $ is a reducing agent.
