JEE Advanced 2013 · Paper 1 · Chemistry Q22

ChemistrySingle correct+2Question 22 of 60

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

\ce{NO2}

\ce{N2O}

\ce{N2O4}

Answer and worked solution

Official answer: B

Photodecomposition. On standing (especially in light) $\ce{4HNO3 -> 4NO2 + O2 + 2H2O}$ ; the dissolved NO₂ colours the acid yellow-brown.

(B)

Topics:Oxoacids

JEE Advanced 2013 · Paper 1, Chemistry question 22