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Why does copper dissolve in ammonia solu...

Why does copper dissolve in ammonia solution ?

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Copper sulphate reacts with `NH_(4)OH` to form a precipitate of copper hydroxide. This precipitate reacts with excess `NH_(4)OH` to form a soluble complex known as tetraamminecopper (II) sulphate.
`CuSO_(4)+2NH_(4)OH to Cu(OH)_(2)darr + (NH_(4))_(2)SO_(4)`
`Cu(OH)_(2)+2(NH_(4))_(2)SO_(4)rarr underset("deep blue soluble salt")([Cu(NH_(3))_(4)]SO_(4))+H_(2)SO_(4)+2H_(2)O`
`[H_(2)SO_(4)+2NH_(4)OH rarr (NH_(4))_(2)SO_(4)+2H_(2)O]`
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -HIGHER ORDER THINKING SKILL (HOTS) QUESTIONS
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  2. Cu(2)S is black and Cu(2)O is red through Cu^(+) has no unpaired elect...

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  3. Why does copper dissolve in ammonia solution ?

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  4. Mercurous ion exists as Hg(2)^(2+). Explain.

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  5. Cu^(+) salts are colourless but Cu^(2+) salts are coloured. Give reaso...

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  7. Ti^(3+), V^(3+), Mn^(2+), Fe^(3+), Co^(2+) form coloured aqueous solut...

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  8. Why do gadolinium (Gd, Z = 64) and lutetium (Lu, Z = 91) have very hig...

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  9. Which element has the lowest atomisation energy in 3d - series ? Expla...

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  10. Stability of Fe^(3+) ion is greater than Mn^(3+) ion but less than Cr^...

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  11. Fe has a much lower tendency to get oxidised than Mn and Cr - explain....

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  12. Scandium is considered to be a transition element though it does not f...

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  13. Why do the transition elements of the 5d - series have much higher ion...

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  14. Fluorine is more electronegative than oxygen. Yet the highest oxidatio...

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  15. It is difficult to find lanthanides in their purest form. Explain.

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  16. The transition metal ions form complexes with water, but does not reac...

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  17. The standard reduction potential of four elements A, B, C & D are - 0....

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  18. Name any two properties of interstitial compounds that are different f...

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  19. Why do the elements of chromium group have high melting points ?

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