Answer :


(a) monovalent material –


We know


1 F (farady) is 1 mol of electrons



1 F = one electron (1.602 x 10-19) ×Avogadro's number (6.022 x 1023)


=96,500 C of charge




We know that amount of charge required by 1 equivalent mass of the substance = 96500 C



For a monovalent material, equivalent mass is its molecular mass



Amount of charge required by 6.023 × 1023 atoms which is the Avogadro’s Number and is equal to 96500 C of charge




Therefore ,amount of charge required by 1 atom =



(b) For a divalent material-




As we know equivalent mass(1U) is 12 times its molecular mass(Z)


We know


1 F (faraday) is 1 mol of electrons



1 F = one electron (1.602 x 10-19) ×Avogadro's number (6.022 x 1023)


= 96,500 C of charge



Amount of charge required is 12 times of 6.023 × 1023 =


= 96500 C of charge



Amount of charge required by 1 atom for a divalent material is –



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