Equilibrium - Result Question 69

####73. Consider the nitration of benzene using mixed conc of $H_2 SO_4$ and $HNO_3$. If a large amount of $KHSO_4$ is added to the mixture, the rate of nitration will be

[2016]

(a) faster

(b) slower

(c) unchanged

(d) doubled

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Solution:

  1. (b) The presence of large amount of $KHSO_4$ will decrease ionisation of $H_2 SO_4$ that result in lesser ionisation of nitric acid and lesser formation of nitronium ion $[NO_2^{+}]$. Hence the rate of nitration will be slower.


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