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Types of Redox Reactions

PbNO32 on hea...

Question

$P b (N O_{3})_{2}$ on heating gives a brown gas which undergoes dimerisation on cooling. Identify the gas.

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Solution

$P b (N O_{3})_{2}$ on heating gives a brown gas nitrogen dioxide $N O_{2}$ which undergoes dimerisation on cooling to form dinitrogen tetraoxide $N_{2} O_{4}$ .
$2 P b (N O_{3})_{2} 673 K - -- \to 4 N O_{2} + 2 P b O + O_{2}$

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

a brown gas is evolved which undergoes dimerization on cooling. Identify the gas.

Q. Assertion :On cooling, the brown colour of nitrogen dioxide disappears. Reason: On cooling,

{N O}_{2}

undergoes dimerisation resulting in the pairing of odd electrons of

{N O}_{2}

.

Q. Assertion :On cooling, the brown colour of nitrogen dioxide disappears. Reason: On cooling,

N O_{2}

undergoes dimerisation resulting in the pairing of the odd electron in

N O_{2}

Q. Assertion :On cooling, the brown colour of nitrogen dioxide disappears. Reason: On cooling,

N O_{2}

undergoes dimerisation resulting in the pairing of the odd electrons in

N O_{2}

Q. Find the number of nitrates which gives

N O_{2}

gas on heating from the following:

Nitrogen dioxide is released on heating:

[

N H_{4} N O_{3}, K N O_{3}, N a N O_{2}, P b (N O_{3})_{2}, A g N O_{3}

]

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