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Why can't copper replace H(2) from an ac...

Why can't copper replace `H_(2)` from an acid solution ?

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The value of `E_(Cu^(2+)|Cu)^(0)` is positive
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -EXERCISE (VERY SHORT ANSWER-TYPE QUESTIONS)
  1. Name the transition element which does not exhibit a variable oxidatio...

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  2. Why does cerium exhibit + 4 oxidation state ?

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  3. Why can't copper replace H(2) from an acid solution ?

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  4. Which is a stronger reducing agent among Cr^(2+) and Fe^(2+) ?

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  5. Why is d^(1) configuration of transition elements highly unstable ?

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  6. Why is the value of E(Cu^(2+)|Cu)^(0)(+0.34V) positive ?

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  7. Standard reduction potential (E^(0)) of Mn^(3+)|Mn^(2+) system is high...

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  8. Why does Mn^(2+) exhibit the highest paramagnetism among the bivalent ...

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  9. What do you obtain if MnO(2) is fused with solid KOH in air ?

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  10. What is the higher oxidation state exhibited by actinoids ?

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  11. Why are Eu^(2+) and Yb^(2+) highly stable ?

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  12. How many unpaired electrons are there in Gd(Z = 64) atom ?

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  13. What is the structure of manganate ion ?

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  14. What is the common oxidation state of the lanthanoids ?

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  15. Why do transition metals have high atomisation energy ?

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  16. Why do transition elements exhibit variable oxidation states ?

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  17. In volumetric analysis, why is K(2)Cr(2)O(7) used to prepare the stand...

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  18. Why is KMnO(4) stored in dark coloured bottles ?

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  19. Why does explosion occur if conc. H(2)SO(4) is added to KMnO(4) ?

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  20. Why is Fe^(2+) ion smaller than Mn^(2+) ion ?

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