1.

Noble metals, like gold and platinum are soluble in which of the following mixtures?

Answer»

1:1 MIXTURE of CONC. `HNO_3` and conc. `H_2SO_4`
1:3 mixture of conc. HCI and conc. `HNO_3`
1:3 mixture of conc. `HNO_3` and conc. HCI
1:3 mixture of conc. `H_2SO_4` and conc. HCI

Solution :Nobel metal such as gold and platinum are soluble in aqua-REGIA which is a mixture of nitric acid and HYDROCHLORIC acid in molar RATIO of `1:3`.
i.e, `3HCI+1 HNO_3`= aqua- regia
Hence option( c) is correct.


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