The basicity of phosphorous acid (H₃PO₃) is
(a) one
(b) two
(c) four
(d) three
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(b) two, because only two hidrogen atoms out of three are attached to most electronegative oxygen and can easily removed and it can determine by number of hydrogen atom attached directly to oxygen.
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Sulphur mainly exists based on two forms and includes allotropes rhombic and monoclinic ranges.
This includes rhombic allotrope that has been established with Sulphur and most stable allotrope of sulphur.
It is yellow solid which consists of S8 puckered rings.
This should be highlighted with forms and includes rhombic allotrope.
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