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Question

For H3PO3 and H3PO4, the correct choice is:

A
H3PO3 is dibasic and non reducing
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B
H3PO3 is dibasic and reducing
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C
H3PO4 is tribasic and reducing
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D
None
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Solution

The correct option is B H3PO3 is dibasic and reducing
Basicity depends on the number of replaceable hydrogens. The hydrogen atoms which are directly attached to O -atoms are replaceable hydrogens due to the greater electronegativity difference between oxygen and hydrogen atoms.

So, the basicity of H3PO4 is 3 and the basicity of H3PO3 is 2.

In H3PO3, the oxidation state of P is +3. So, it can get further oxidised and accordingly can act as a reducing agent. But in H3PO4, the oxidation state of P is +5, which is the the highest oxidation state for P atom. Thus, H3PO4 is non reducing.

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