What is the answer for question 17 and what is mean by "number of electrons for complete discharge?"

enter image description here

Which of the following needs the largest number of electrons for complete discharge during an electrolysis process?
a) 3 mol of $\ce{Al^{3+}}$
b) 4 mol of $\ce{Al^{3+}}$ ions
c) 5 mol of $\ce{OH^-}$ ions
d) 7 mol of $\ce{O^{2-}}$ ions


closed as off-topic by airhuff, Tyberius, Ivan Neretin, orthocresol Oct 4 '18 at 11:00

This question appears to be off-topic. The users who voted to close gave this specific reason:

If this question can be reworded to fit the rules in the help center, please edit the question.


$$\text{a)} 3\times+3 = 9$$ $$\text{b)} 4\times+3 = 12$$ $$\text{c)} 5\times-1= -5$$ $$\text{d)} 7\times-2 = -14$$ This seems like an ambiguous question.

  • b) "needs" the most electrons supplied to become neutral
  • d) "gives up" more electrons than b) to become neutral.

I'd have to take "needs" literally and go with b) as the answer.


Not the answer you're looking for? Browse other questions tagged or ask your own question.