Which of the following acids forms three series of salts? 

(i) H₃PO₂

(ii) H₃BO₃ 

(iii) H₃PO₄

(iv) H₃PO₃

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p>Correct option is (iii)&nbsp;H₃PO₄</p><p>When it reacts with a metal atom, it can produce three different forms of salts, referred known as the three series of salts.</p><p>H₃PO₄&nbsp;+ Na→NaH₂PO₄</p><p>NaH₂PO₄&nbsp;+ Na→Na₂HPO₄</p><p><span data-teams="true">Na₂HPO₄&nbsp;+ Na→Na₃PO₄</span></p>

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