Question

Which of the following ion will form most water soluble hydroxide. A. K+ B. Ni2+ C. Zn2+ D. Al3+

Answer 1

u should see the lattice energy , which is nothing but the q/r ratio

if lattice enthalpy is more, the bond will be unbreakable easily

ans will be (A)

Alt:

u just see which will make weak bonded hydroxide

u also may judge- bigger size= less bond strength so soluble