Which Hydroxides are weak electrolytes?

Question

i. Sr(OH)2
ii. KOH
iii. NaOH
iv. Ba(OH)2

ii and iv
i, ii, iii, and iv
ii and iii
none of these is a weak electrolyte

Answer 1

None of these are weak electrolytes. Actually Sr(OH)2 is not a strong electrolyte either but because there is no choice considereing Sr(OH)2 alone, then none of the above will be an appropriate answer. KOH, NaOH and Ba(OH)2 are definitely strong electrolytes because they are strong bases which dissociate almost 100% in water.