With reference to aqua regia,choose the corre | vedclass

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(D) $(1)$ The reaction of gold with aqua regia produces $NO$ (nitric oxide),not $NO_2$. Thus,statement $(1)$ is incorrect.$(2)$ Aqua regia is indeed p

Vedclass · Accepted Answer

$2, 3, 4$

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(D) $(1)$ The reaction of gold with aqua regia produces $NO$ (nitric oxide),not $NO_2$. Thus,statement $(1)$ is incorrect.$(2)$ Aqua regia is indeed prepared by mixing concentrated $HCl$ and concentrated $HNO_3$ in a $3:1$ volume ratio. Thus,statement $(2)$ is correct.$(3)$ The reaction is $Au + 4H^+ + NO_3^- + 4Cl^- \rightarrow AuCl_4^- + NO + 2H_2O$. The complex ion $AuCl_4^-$ contains gold in the $+3$ oxidation state. Thus,statement $(3)$ is correct.$(4)$ The yellow-orange colour of aqua regia is due to the formation of nitrosyl chloride $(NOCl)$ and chlorine $(Cl_2)$. Thus,statement $(4)$ is correct.

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