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What is aqua regia ? Why are gold and pl...

What is aqua regia ? Why are gold and platinum soluble in it ?

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### Step-by-Step Solution: **Step 1: Define Aqua Regia** Aqua regia is a highly corrosive mixture of two strong acids: hydrochloric acid (HCl) and nitric acid (HNO3). It is commonly referred to as "royal water" due to its ability to dissolve noble metals like gold and platinum. **Step 2: Composition of Aqua Regia** Aqua regia is prepared by mixing hydrochloric acid and nitric acid in a specific ratio. The typical ratio used is 3 parts hydrochloric acid to 1 part nitric acid by volume. ...
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Knowledge Check

  • Aqua regia is

    A
    `conc. HC + conc. HNO_3 in 1: 3 ratio`
    B
    `dil. HCI and di.HNO_3 in 3:1 ratio`
    C
    `dil. HCT and dil. HNO_3 in 3:1 ratio`
    D
    `conc. HCl and conc. HNO_3 in 3 : 1 ratio`

  • Aqua regia is

    A
    `Conc. HNO_3 + 2 conc. HCl`
    B
    `Conc. HNO_3 + 3 conc. HCl`
    C
    `Conc. HNO_3 + NO_2`
    D
    `Conc.HNO_3 + conc. H_2 SO_4`

  • Aqua regia is a mixture of

    A
    three parts of concentrated nitric acid and one part of concentrated hydrochloric acid
    B
    three parts of concentrated hydrochloric acid and one part concentrated nitric acid
    C
    three parts of dilute hydrochloric acid and 1 part of dilute nitric acid
    D
    three parts of dilute nitric acid and one part of dilute hydrochloric acid

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