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Ag or Au is available in free state in n...

Ag or Au is available in free state in nature, while Ca or K is not - explain.

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Both Ag and Au have very high standard reduction potential. Hence they have vary little tendency to get oxidised in the atmosphere. Therefore they can be found in free state in nature. However, Ca and K have low (high negative) standard reduction potential which leads to easier oxidation in the atmosphere. Thus they can hardly be found in atmosphere in free state.
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CHHAYA PUBLICATION-ELECTROCHEMISTRY-WARM UP EXERCISE
  1. The standard reduction potentials of Ca^(2+)|Ca, Zn^(2+)|Zn, H^(+)|(1)...

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  2. The standard reduction potentials of Ni^(2+)|Ni, Cr^(3+)|Cr, Ag^(+)|Ag...

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  3. Ag or Au is available in free state in nature, while Ca or K is not - ...

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  4. It the reaction, 2Ag(s)+Fe^(2+)(aq)rarr2Ag^(+)(aq)+Fe(s) possible? Giv...

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  5. Which one of Sn, Cu, Cr, Al can reduce Fe^(2+) ion in aqueous medium? ...

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  6. The standard reduction potentials of Li^(+)|Li, Na^(+)|Na and Mg^(2+)|...

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  7. Arrange the ions Ag^(+), Zn^(2+), H^(+) and Na^(+) in order of their i...

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  8. The standard reduction potential of metals A, B, C, and D are +0.80V, ...

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  9. Given that E("Al^(3+)|Al)^(@)=-1.66V, E(Cd^(2+)|Cd)^(@)=-0.40V, E(Pb^(...

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  11. Construct galvanic cells for the given spontaneous radox reactions. ...

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  12. Write Nernst equation for the redox reaction occurring in the followin...

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  13. Write the anode and cathode reactions for the given cell reactions. ...

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  14. Write the anode and cathode reactions for the given cell reactions. ...

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  15. Write the anode and cathode reactions for the given cell reactions. ...

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  16. Consider the galvanic cell Cu|Cu^(2+)(0.13M)||Ag^(+)(0.01M)|Ag (i) Cal...

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  17. Will the following reaction be spontaneous under standard conditions? ...

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  18. The reaction H(2)(g)+Cu^(2+)(aq)rarr Cu(s)+2H^(+)(aq) occurs in a gal...

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  19. Identify, with a reason, the stronger oxidising agent in each of the f...

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  20. Identify, with a reason, the stronger oxidising agent in each of the f...

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