The balanced chemical equation for the reaction of an alkaline solution of sodium nitrate with zinc is :

Z n + N a N O_{2} + N a O H \to Z n O H + N a O H + H_{2} O

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Z n + N a N O_{2} + N a O H \to N a_{2} Z n O_{2} + N H_{4} O H + H_{2} O

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3 Z n + N a N O_{2} + 5 N a O H \to 3 N a_{2} Z n O_{2} + N H_{3} + H_{2} O

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Z n + N a N O_{2} + 4 N a O H \to N a_{2} Z n O_{2} + N H_{4} O H + H_{2} O_{2}

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Solution

The correct option is B $3 Z n + N a N O_{2} + 5 N a O H \to 3 N a_{2} Z n O_{2} + N H_{3} + H_{2} O$
When an aqueous solution of sodium nitrate is heated with zinc, sodium zincate and ammonia is produced.
The balance chemical equation for the above reaction is :
$N a N O_{2} + 3 Z n + 5 N a O H \to 3 N a_{2} Z n O_{2} + H_{2} O + N H_{3}$

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