Question

If one mole electrons are passed through solutions of MgSO₄, AgNO₃ and A1C1₃, in what mole ration the metals Mg, Ag and A1 will be deposited at the electrodes? Select the proper choice from the given multiple choices.
(A) 1:1:1
(B) 1:2:3
(C) 2:1:3
(D) 3:6:2

Answer 1

the no of electrons that transfered in the ratio 2:1:3

then mole ratios 1/2: 1: 1/3

= 3:6:2

Answer 2

If one mole of electrons are passed through solutions of MgSO₄, AgNO₃ and A1C1₃, the mole ratio in which Mg, Ag and Al will be deposited at the electrodes is 3:6:2.

Due to the electrochemical reaction, the number of electrons that are deposited will be in the ratio of the number of charges present in the compounds. So, for the three metals, it will be 2:1:3. However, the mole ratio of the metals will be 1/2:1:1/3. As a result, this ratio becomes 3:6:2.