Comprehension:
The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.

Which of the following acts as an oxidising as well as reducing agent ?

N a_{2} O

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N a O_{2}

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N a N O_{3}

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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 ) acts both as oxidising agent and reducing agent because the nitrogen atom in it is in +3 oxidation state (+3 is intermediate oxidation state for nitrogen). So, $N$ can go to its highest oxidation state $+ 5$ through oxidation and can to lower oxidation state such as $+ 2$ through reduction.
Oxidising property : $2 N a N O_{2} + 2 K I + 2 H_{2} S O_{4} \to N a S O_{4} + K_{2} S O_{4} + 2 N O + 2 H_{2} O + I_{2}$
Reducing property : $N a N O_{2} + H_{2} O_{2} \to N a N O_{3} + H_{2} O$

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Similar questions

(1) Basic strength of oxides : C s_{2} O < R b_{2} O < N a_{2} O < L i_{2} O

(2) Stability of peroxides : N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}

(3) Stability of bicarbonates : L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

(4) Melting point : N a F < N a C l < N a B r < N a I

C s_{2} O < R b_{2} O < K_{2} O < N a_{2} O < L i_{2} O

N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}

L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

N a F < N a C I < N a B r < N a I

(1) Basic strength of oxides : C s_{2} O < R b_{2} O < N a_{2} O < L i_{2} O

(2) Stability of peroxides : N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}

(3) Stability of bicarbonates : L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

(4) Melting point : N a F < N a C l < N a B r < N a I

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