pBlock ElementsII 1 Question 14

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

(2013 Main)

(a) NO

(b) NO2

(c) N2O

(d) N2O4

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Answer:

Correct Answer: 14. (b)

Solution: 14. NO2 is a brown coloured gas and imparts this colour to concentrated HNO3 during long standing.

4HNO32H2O+2NO2+3O2



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