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  4. The compound that cannot act both as oxidising and reducing agent is :

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Q. The compound that cannot act both as oxidising and reducing agent is :

JEE MainJEE Main 2020Redox Reactions

Solution:

$\left(i\right)H_{2}O_{2}$ act as oxidising agent as well as reducing agent depending on condition.
(ii) $H_{2}SO_{3}$ act as oxidising agent as well as reducing agent depending on condition.
(iii) $HNO_{2}$ act as oxidising agent as well as reducing agent depending on condition.
(iv) $H_{3}PO_{4}$ can not act both as oxidising and reducing agent.
$H_{3}PO_{4}$ can act as only oxidising agent.
$H_{3}PO_{4} {\rightleftharpoons} 3H^{+}+PO_{4}^{3-}$