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What is aqua regia ? Write its reaction ...

What is aqua regia ? Write its reaction with gold and platinum.

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A mixture of 3 parts of Conc. HCl and one part of Conc. `"HNO"_(3)` constitutes aqua regia.
It is used for dissolving noble metals.
It's reaction with gold :
`"Au"+4H^(+)+NO_(3)^(-)4Cl^(-)to"Au"Cl_(4)^(-)+NO+2" H"_(2)O`
It's reaction with Platinum :
`3Pt+16H^(+)+4"NO"_(3)^(-)+18Cl^(-)to3"Pt"Cl_(6)^(-2)+4"NO"+8" H"_(2)O`
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-P-BLOCK ELEMENTS -GROUP - 17 ELEMENTS (VERY SHORT ANSWER QUESTIONS)
  1. What happens when Cl(2) reacts with dry slaked lime ?

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  2. Chlorine acts as an oxidizing agent - explain with two examples.

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  3. What is aqua regia ? Write its reaction with gold and platinum.

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  4. How is chlorine manufactured by Deacon's method ?

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  5. Chlorine acts as a bleaching agent only in the presence of moisture - ...

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  6. The decreasing order of acidic character among hypohalogen acids is HC...

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  7. The acidic nature of the oxoacids of chlorine is HOCl ltHClO(2)ltHCl...

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  8. What are interhalogen compounds ? Give two examples.

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  9. Explain the structure of ClF(3).

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  10. OF(2) should be called oxygen difluolide and not fluorine oxide - Why ...

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  11. Iodine is more soluble in KI than in water - Explain.

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  12. Among the hydrides of halogens Which is most stable ?

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  13. Among the hydrides of halogens Which is most acidic ?

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  14. Among the hydrides of halogens Which has lowest boiling point ?

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  15. Compare the bleaching action of Cl(2) and SO(2).

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  16. Give the oxidation states of halogens in the following : Cl(2)O

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  17. Give the oxidation states of halogens in the following : ClO(2)^(-)

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  18. Give the oxidation states of halogens in the following : KBrO(3)

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  19. Give the oxidation states of halogens in the following : NaClO(4)

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  20. Describe the molecular shape of I(3)^(-). (Hint : Central iodine is ...

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