Test Index

UPSEE Solved Model Paper 6

Question : 76 of 150

Marks: +1, -0

Aqua regia reacts with platinum to yield

Solution:

Aqua regia is a mixture of 3 parts of conc. HCl and 1 part of conc.

\mathrm{HNO}_3

. It contains nascent chlorine atom and hence dissolves Pt as chloroplatinic acid,

\mathrm{H_2PtCl_6}

\underset{\text{(conc.)}}{3\mathrm{HCl}}+\underset{\text{(conc.)}}{\mathrm{HNO_3}}

→

\mathrm{NOCl}+\underset{\text{(nacent)}}{2\mathrm{H_2O}}+2\mathrm{Cl}

\mathrm{Pt}+4\mathrm{Cl}\rightarrow\mathrm{PtCl}_4

\mathrm{PtCl}_4+2\mathrm{HCl}\rightarrow\underset{\text{(Chloroplatinic acid)}}{\mathrm{H_2PtCl_6}}

Go to Question:

Prev Question

Next Question