Number of acids having central atom in \( +3 \) oxidation state amo...
Number of acids having central atom in \( +3 \) oxidation state among the following is :
(a) \( \mathrm{HNO}_{2} \)
(b) \( \mathrm{HNO}_{3} \)
(c) \( \mathrm{H}_{3} \mathrm{PO}_{2} \)
(d) \( \mathrm{H}_{3} \mathrm{PO}_{3} \)
\( \mathrm{P} \)
\( \begin{array}{llll}\text { (e) } \mathrm{H}_{3} \mathrm{PO}_{4} & \text { (f) } \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5} & \text { (g) } \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7} & \text { (h) } \mathrm{H}_{2} \mathrm{SO}_{3}\end{array} \)
W
\( \begin{array}{lll}\text { (i) } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7} & \text { (j) } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8} & \text { (k) } \mathrm{H}_{2} \mathrm{SO}_{4}\end{array} \)
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