The basicity of phosphorus acid `(H_3 PO_3)` is ______ .
The basicity of phosphorus acid `(H_3 PO_3)` is ______ .
A. 1
B. 2
C. 3
D. 4
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The basicity of phosphorus acid `(H_3 PO_3)` is ______ .
A. 1
B. 2
C. 3
D. 4