Total number of Amophoteric species among the followingCN⊖,HSO4⊕,SO3−2,H2PO3⊕,H2PO2⊖,H2O,NH4⊕

Amphoteric can donate and accept protonsHSO4⊕,H2PO3⊕,H2O are Amphoteric

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Total number of Amophoteric species among the following
${CN}^{⊖}, {HSO}_{4}^{\oplus}, {SO}_{3}^{- 2}, H_{2} {PO}_{3}^{\oplus}, H_{2} {PO}_{2}^{⊖}, H_{2} O, {NH}_{4}^{\oplus}$

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answer is 3.

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Amphoteric can donate and accept protons

${HSO}_{4}^{\oplus}, H_{2} {PO}_{3}^{\oplus}, H_{2} O$ are Amphoteric

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