Thermal decomposition of $H N O_{3}$ releases yellow-brown coloured fumes due to the formation of gas.

N O_{2}

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N O_{3}

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O_{2}

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Solution

The correct option is A $N O_{2}$
When $H N O_{3}$ is heated, it undergoes thermal decompostion and produces $H_{2} O, N O_{2} a n d O_{2}$ . The yellow-brown coloured fumes are of the $N O_{2}$ gas formed.
$4 H N O_{3} Δ - \to 2 H_{2} O + 4 N O_{2} (↑) + O_{2} (↑)$
$(y e l l o w - b r o w n)$

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Q. Which of the following thermal decomposition reactions occurs with emission of brown fumes?

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upon long standing, turns yellow-brown due to the formation of
(IIT-JEE, 2012)

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(IIT-JEE, 2012)

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Thermal decomposition of HNO3 releases yellow-brown coloured fumes due to the formation of gas.

The correct option is A NO2When HNO3 is heated, it undergoes thermal decompostion and produces H2O,NO2 and O2. The yellow-brown coloured fumes are of the NO2 gas formed. 4HNO3Δ−→2H2O+4NO2(↑)+O2(↑) (yellow−brown)

Thermal decomposition of $H N O_{3}$ releases yellow-brown coloured fumes due to the formation of gas.

The correct option is A $N O_{2}$
When $H N O_{3}$ is heated, it undergoes thermal decompostion and produces $H_{2} O, N O_{2} a n d O_{2}$ . The yellow-brown coloured fumes are of the $N O_{2}$ gas formed.
$4 H N O_{3} Δ - \to 2 H_{2} O + 4 N O_{2} (↑) + O_{2} (↑)$
$(y e l l o w - b r o w n)$