Which of the following substances acts as an oxidising as well as a reducing agent

N a_{2} O

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S n C l_{2}

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N a_{2} O_{2}

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N a N O_{2}

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Solution

The correct option is D $N a N O_{2}$
$N a N O_{2}$ (Sodium nitrite) act both as oxidising as well as reducing agent because in it N atom is in +3 oxidation state (intermediate oxidation state) Oxidising property
$2 N a N O_{2} + 2 K I + 2 H_{2} S O_{4} \to N a_{2} S O_{4} + K_{2} S O_{4} + 2 N O + 2 H_{2} O + I_{2}$
Reducing property
$H_{2} O_{2} + N a N O_{2} \to N a N O_{3} + H_{2} O$ .

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Name one substance which acts as both oxidising as well as reducing agent

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