The name and basicity of \( \mathrm{H}_{3} \mathrm{PO}_{2} \) are respectively. (A) Phosphorus a...

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The name and basicity of \( \mathrm{H}_{3} \mathrm{PO}_{2} \) are respectively.
(A) Phosphorus acid, 2
(B) Phosphoric acid, 1
(C) Hypophosphorus acid, 2
(D) Hypophosphorus acid, \( 1 . \)
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