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Why does not copper liberate hydrogen fr...

Why does not copper liberate hydrogen from acids. ?

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Copper placed below hydrogen in the electrochemical series. It is not in a position to release electrons to `H^(+)` ions of the acid. Therefore, hydrogen gas is not evolved.
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Why does copper not replace hydrogen from acids?

Which of the following metals does not liberate hydrogen from acids?

A metal M does not liberate hydrogen from acids but reacts with oxygen Q 5 to give a black colour product. Identify M and black coloured produCt and also explain the reaction of M with oxygen.

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Knowledge Check

  • Which of the following metals does not liberate hydrogen from acids?

    A
    Fe
    B
    Cu
    C
    Mg
    D
    Zn

  • A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. The metal M is

    A
    zinc
    B
    iron
    C
    copper
    D
    aluminium

  • A metal X does not liberate hydrogen from acids but reacts with oxygen to give a black coloured product. Metal X and the black coloured product could be respectively

    A
    silver and silver sulphide
    B
    copper and copper oxide
    C
    iron and iron oxide
    D
    aluminium and aluminium oxide.
    • DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Short Answer type questions.
    1. Why does not copper liberate hydrogen from acids. ?

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    2. Why E^(@) value of Mn, Ni and Zn are more negative than expected ?

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    3. Why is first ionisation enthalpy of Cr lower than that of Zn ?

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    4. Transition elements show high melting points. Why?

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    5. Out of Cu(2)Cl(2), which is more stable and why ?

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    6. When a brown compound of manganese [A] is treated with HCl, it gives a...

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    7. When Cu^(2+) ion is treated with KI, a white precipitate is formed. Ex...

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    8. Although flurorine is more electronegative than oxygen, but the abilit...

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    9. Although Cr^(3+) and Co^(2+) ions have same number of unpaired electro...

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    10. Ionisation enthalpies of Ce, Pr and Nd are higher than those of Th, Pa...

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    11. Although Zr belongs to 4d and Hf belongs to 5d transition series, but...

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    12. Although +3 oxidation stae is thje characteristic oxidation state of ...

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    13. Explain why does colour of KMnO(4) disappear when oxalic acids is adde...

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    14. When orange solution containing Cr(2)O(7)^(2-) ion is treated with an ...

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    15. A solution of KMnO(4) on reduction yields either a colourless solution...

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    16. The second and third rows of transition elements resemble each other ...

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    17. E^(@) of Cu is +0.34 V while that of Zn is -0.736 V. Explain.

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    18. The halides of transition elements become more covalent with increasin...

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    19. While filling up electron in the atomic orbitals, 4s orbital is filled...

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    20. Reactivity of transition element decreases almost regularly from Sc t...

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