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What is aqua-regia ? How it works to dis...

What is aqua-regia ? How it works to dissolve noble metals ?

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Aqua-regia is `3:1` mixture of conc. `HNO_(3)` and conc. `HCI`. The mixture contains nascent chlorine produced due to reduction of `HCI` by `HNO_(3)`. This chlorine reacts with noble metals to dissolve them.
`HNO_(3)+3HClrarr 2H_(2)O+2Cl+NOCl`
`Au+3ClrarrAuCl_(3), AuCl_(3)+HClrarr HAuCl_(3)" (chloroauric acid)"`
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AAKASH SERIES-GROUP 15 ELEMENTS-EXERCISE - 1.2
  1. What is aqua-regia ? How it works to dissolve noble metals ?

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  2. Discuss the structure and bonding in P(4) molecule.

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  3. What is allotropy ? Give the allotropes of oxygen.

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  4. Comment on the M-M bond strengths and catenation ability of group 15 e...

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  5. Elemental phosphorus is not diatomic like nitrogen. Explain.

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  6. Write the difference between the properties of white phosphorus and re...

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  7. Mention the oxidation numbers exhibited by nitrogen. Give an example f...

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  8. Nitrogen is trivalent, but phosphorus is pentavalent in its compounds....

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  9. PH(3) is stable in air, but catches fire when heated at 425K. Why?

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  10. Discuss the stability of hydrides of group 15 elements.

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  11. Write the trends in bond length, bond angle, and boiling points of MH(...

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  12. Nitrogen forms several oxides. Why?

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  13. Nitrous oxide supports combustion more vigorously than air. Why?

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  14. In case of phosphorus trihalides, bond angle increases from PF(3) to P...

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  15. NH(3) and NF(3) are both pyramidal. What observations are made on the ...

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  16. The correct order of bond angles is NO(2)^(+) gt NO(2) gt NO(2)^(-) . ...

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  17. Copper metal gives different products on reaction with nitric acid. Il...

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  18. Discuss the structure and basicity of orthophosphorus acid.

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  19. Draw the structures of -ous acids of phosphorus and discuss their redu...

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  20. What hapens when the following are heated? (a) orthophosphoric acid ...

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  21. Nitrogen behaves abnormally from the other elements of the same group....

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