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(C) In the nitration of aniline using $HNO_3$ and $H_2SO_4$,aniline is protonated to form the anilinium ion $(C_6H_5NH_3^+)$,which is meta-directing.H

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$B$ and $D$ are correct statements.

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(C) In the nitration of aniline using $HNO_3$ and $H_2SO_4$,aniline is protonated to form the anilinium ion $(C_6H_5NH_3^+)$,which is meta-directing.However,due to the presence of some unprotonated aniline,ortho and para products are also formed.Experimental results show that $m$-nitroaniline $(47\%)$ and $p$-nitroaniline $(51\%)$ are the major products.Thus,statement $(B)$ is correct.In the reaction between $HNO_3$ and $H_2SO_4$,$H_2SO_4$ acts as an acid and $HNO_3$ acts as a base:$HNO_3 + H_2SO_4$ $\rightarrow H_2NO_3^+ + HSO_4^-$ $\rightarrow NO_2^+ + H_2O + HSO_4^-$.Thus,statement $(D)$ is correct.Therefore,statements $(B)$ and $(D)$ are correct.

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