Which of the following leaves no residue on heating ?

P b (N O_{3})_{2}

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N H_{4} N O_{3}

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C u (N O_{3})_{2}

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N a N O_{3}

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Solution

The correct option is A $N H_{4} N O_{3}$
$2 N a N O_{3} Λ \to 2 N a N O_{2} + O_{2}$
$2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$
$2 C u (N O_{3})_{2} \to 2 C u O + 4 N O_{2} + O_{2}$
$N H_{4} N O_{3} \to N_{2} O + 2 H_{2} O$
$N H_{4} N O_{3}$ leaves no residue on heating
Hence option B is correct.

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