Question

What is the lowest oxidation state possessed by phosphorus in its oxyacids?

• A. +4
• B. +2
• C. +5
• D. +1

Hint:

The lowest oxidation state of phosphorus in oxyacids is +1, which is found in hypophosphorous acid (H\(_3\)PO\(_2\)).

Answer 1

The Correct Option is D

Step 1: Understanding Oxidation States.
Phosphorus can have various oxidation states in its oxyacids, ranging from +1 to +5. The lowest oxidation state of phosphorus is +1, as seen in hypophosphorous acid (H\(_3\)PO\(_2\)).

Step 2: Analyzing the options.
(A) +4: Incorrect. Phosphorus can have an oxidation state of +4 in acids like phosphoric acid (H\(_3\)PO\(_4\)), but this is not the lowest.
(B) +2: Incorrect. This oxidation state does not correspond to phosphorus in any of its oxyacids.
(C) +5: Incorrect. The +5 oxidation state of phosphorus is the highest, found in phosphoric acid.
(D) +1: Correct. The lowest oxidation state of phosphorus in its oxyacids is +1, seen in hypophosphorous acid.

Step 3: Conclusion.
The lowest oxidation state of phosphorus in its oxyacids is +1, corresponding to option (D).