The true statement for the acids of phosphorus, \( \mathrm{H}_{3} \...

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The true statement for the acids of phosphorus, \( \mathrm{H}_{3} \mathrm{PO}_{2}, \mathrm{H}_{3} \mathrm{PO}_{3} \) and \( \mathrm{H}_{3} \mathrm{PO}_{4} \) is :
(AIIMS 2003)
\( \mathrm{P} \)
(a) The order of their acidity is : \( \mathrm{H}_{3} \mathrm{PO}_{4}\mathrm{H}_{3} \mathrm{PO}_{3}\mathrm{H}_{3} \mathrm{PO}_{2} \).
(b) All of them are reducing in nature.
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(c) All of them are tribasic acids.
(d) The geometry of phosphorus is tetrahedral in all the three.
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