1.

Aqua regia is

Answer»

`conc. HC + conc. HNO_3 in 1: 3 ratio`
`DIL. HCI and di.HNO_3 in 3:1 ratio`
`dil. HCT and dil. HNO_3 in 3:1 ratio`
`conc. HCl and conc. HNO_3 in 3 : 1 ratio`

Answer :D


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