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What makes gold to dissolve in aqua-regi...

What makes gold to dissolve in aqua-regia? 

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AAKASH SERIES-GROUP 17 ELEMENTS-EXERCISE - 3.2
  1. Phosphoric acid is preferred in place of sulphuric acid in the prepara...

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  2. Fluorine is called super halogen. Why?

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  3. How is chlorine prepared in the laboratory and on a commercial scale?

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  4. How does chlorine react with (a) Fe, (b) H(2)O and (c) H(2)S? Give equ...

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  5. Write the addition reactions of chlorine with (a) non-metal oxides and...

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  6. What makes gold to dissolve in aqua-regia?

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  7. How is chlorine used (a) in bleaching, (b) as disinfectant and (c) in ...

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  8. Ferric chloride FeCl(3) is stable, but ferric iodide Fel(3) is unstabl...

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  9. CIF(3) exists but not FCl(3). Substantiate.

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  10. HI is prepared from Nal, using H(3)PO(3) but not H(2)SO(4). Explain.

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  11. Mention the action of blue litmus by hypochlorous acid.

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  12. Although oxygen contentent is high in perchlorate, it does not act as ...

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  13. Red roses on exposure to moist chlorine permanently turns colourless. ...

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  14. Na(2)SO(3) + HCl rarr Na(2)SO(4) + H(2)O+X X + Na(2) S overset( Delt...

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  15. NH(4)Cl+NaOH rarr "(Gas A)", NaCl+H(2)SO(4)rarr "(Gas B)" Discuss th...

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  16. A metal halide X on treating with copper sulphate solution yields a br...

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  17. A liquid (A) is treated with Na(2) CO(3) solution. A mixture of two sa...

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  18. Gradual addition potassium iodide with nitric acid produces a dark bro...

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  19. NaCl + K(2)Cr(2)O(7)+H(2)SO(4) rarr NA(2)SO(4) + K(2) SO(4) +H(2)O +X ...

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  20. A black power (X) when treated with common salt and chamber acid gives...

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