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What is aqua-regia? Name two special met...

What is aqua-regia? Name two special metals which are insoluble in common reagents but dissolve in aqua-regia.

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Aqua regia is

Gas relaesed when Au,Pt dissolves in aqua-regia

What is aqua regia? How is it prepared?

Gold dissolves in a aqua-regia forming:

LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
  1. From amongst the metals sodium, calcium, aluminium, copper and magnesi...

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  2. What changes in the colour of iron nails and copper sulphate solution ...

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  3. What is aqua-regia? Name two special metals which are insoluble in com...

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  4. Give the names and formulae of (a) two acidic oxides, and (b) two basi...

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  5. What name is given to those metal oxides which show basic as well as a...

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  6. Name two metals which form amphoteric oxides.

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  7. A copper coin is kept immersed in a solution of silver nitrate for som...

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  8. Which property of copper and aluminium makes them suitable: (a). For...

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  9. Write the name and formulae of (a) a metal hydride, ad (b) a non-metal...

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  10. Name the metal which has been placed: (a). At the bottom of the reac...

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  11. Which of the two metals is more reactive: copper or silver?

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  12. (a). Name one metal which is stored in kerosene oil. (b). Name one n...

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  13. Write equation for the reaction of (a). Sodium with oxygen (b) mag...

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  14. Name two metals which are used: (a). For making electric wires (b)...

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  15. Which metal foil is used for packing some of the medicine tables.?

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  16. Name the non-metal which is used: (a). To convert vegetable oil into...

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  17. Name one property which is characteristic of (a) metals, and (b) non-m...

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  18. What is meant by "brittleness"? Which type of elements usually show br...

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  19. What will happen if a strip of zinc is immersed in a solution of coppe...

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  20. What will happen if a strip of copper is kept immersed in a solution f...

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