ICSE Class 10 Chemistry 2023 Solved Paper

Arrange the following according to the instructions given in brackets :

Question : 80 of 88

Marks: +1, -0

{\Cu}^{2+}, {\Na}^{+}, {\Zn}^{2+}, {\Ag}^{+}

(The order of Preferential discharge at the cathode)

Solution:

{\Na}^{+} < {\Zn}^{2+}< {\Cu}^{2+}< {\Ag}^{+}

During electrolysis of aqueous solution, if a cation has higher electrode potential then water, it preferentially discharge at the cathode. The elements in the lower position in electro-chemical series gets discharged more easily, so

{\Na}^{+}

discharged least preferentially and

{\Ag}^{+}

more preferentially.

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