Sodium nitrate on heating with zinc dust and caustic soda gives:

N a N O_{2}

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N H_{3}

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N O_{2}

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N_{2} O

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Solution

The correct option is B $N H_{3}$
Reaction:
$N a N O_{3} + 4 Z n + 7 N a O H \to N H_{3} + 4 N a_{2} Z n O_{2} + 2 H_{2} O$

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