
Incorrect statement about pyrophosphorous acid is:
(A) It contains P in +5 oxidation state.
(B) It is dibasic.
(C) It is strongly reduced in nature.
(D) It contains one bond.
Answer
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Hint: Pyrophosphorous acid is an oxoacid of phosphorus. All the oxoacids of phosphorus have at least one and one bond in their structure.
Complete step by step answer:
In oxoacids, phosphorus have four groups or atoms arranged in a tetrahedron. Structure of pyrophosphorous acid is given below:
Some of the important characteristics of pyrophosphorous acid are discussed below:
It is clear from the structure given above that contains two , two , two and one bond.
Oxidation state of P in can be calculated as follows:
Let the oxidation state of P be ‘x’. Oxidation state of H is +1 and of O is taken as -2.
Therefore, P is present in +3 oxidation state.
The bonds present in are ionizable and give ions. Basicity of oxoacids depends on the number of ions. Thus, the basicity of is 2 i.e. it is a dibasic acid.
Greater the number of bonds, stronger is the reducing agent. contains two bonds thus, it is strongly reduced in nature.
Based on the above discussed points, it is clear that the oxidation state of phosphorus in pyrophosphorous acid is +3 and not +5.
So, the correct answer to the question is option (A).
Note: Carefully calculate the oxidation state and the number of different bonds present. Do not confuse pyrophosphorous acid with any other oxoacid of phosphorus.
Complete step by step answer:
In oxoacids, phosphorus have four groups or atoms arranged in a tetrahedron. Structure of pyrophosphorous acid

Some of the important characteristics of pyrophosphorous acid
It is clear from the structure given above that
Oxidation state of P in
Let the oxidation state of P be ‘x’. Oxidation state of H is +1 and of O is taken as -2.
Therefore, P is present in +3 oxidation state.
The
Greater the number of
Based on the above discussed points, it is clear that the oxidation state of phosphorus in pyrophosphorous acid is +3 and not +5.
So, the correct answer to the question is option (A).
Note: Carefully calculate the oxidation state and the number of different bonds present. Do not confuse pyrophosphorous acid with any other oxoacid of phosphorus.
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