The compound that cannot act both as oxidising and reducing agent is :
$\mathrm{H}_{2} \mathrm{O}_{2}$
$\mathrm{H}_{2} \mathrm{SO}_{3}$
$\mathrm{HNO}_{2}$
$\mathrm{H}_{3} \mathrm{PO}_{4}$
Correct Option: , 4
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