pBlock ElementsII - Result Question 129

####14. Concentrated nitric acid upon long standing, turns yellow-brown due to the formation of

(2013 Main)

(a) $NO$

(b) $NO _2$

(c) $N _2 O$

(d) $N _2 O _4$

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Solution:

  1. $NO _2$ is a brown coloured gas and imparts this colour to concentrated $HNO _3$ during long standing.

$$ 4 HNO _3 \longrightarrow 2 H _2 O+2 NO _2+3 O _2 $$



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