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Why are the elements at higher positions...

Why are the elements at higher positions in the electrochemical series not available in free state in nature?

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CHHAYA PUBLICATION-ELECTROCHEMISTRY-EXERCISE (SHORT ANSWER-TYPE QUESTIONS)
  1. What will be the change in the half-cell potential, if the concen-trat...

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  2. Which one of the following reactions will be spontaneous if the standa...

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  3. Why are the elements at higher positions in the electrochemical series...

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  4. A solution contains X^(-) and Z^(-)of concentration 1(M) each. A gas X...

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  5. What is the way to detect whether the representation of a chemical cel...

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  6. Show that the chemical equivalent of an element is 96500 times of its ...

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  7. Which one among conductance, specific conductance and equivalent condu...

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  8. Why is alternating current used instead of direct current, for measure...

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  9. Which of the following has a greater equivalent s conductivity? (a)100...

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  10. If at a definite temperature, the equivalent conductivity at S infinit...

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  11. When an aqueous solution of KBr is electrolysed, Br(2) is evolved at a...

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  12. What is conductance ratio? What is the relation of this to the degree ...

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  13. Arrange the following aqueous solutions in ascending order of their mo...

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  14. What are the factors that determine the cnductance of an aqueous elect...

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  15. At a particular temperature, the molar conductivity at infinite diluti...

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  16. At a definite temperature, with the same conductivity cell, the specif...

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  17. Write Nernst equation for electrode potential for the following electr...

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  18. Write Nernst equation for electrode potential for the following electr...

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  19. For the following electrode reaction, write Nernst equation of electro...

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  20. A platinum foil coated with platinum black is dipped in an acid soluti...

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