Which of the following gives the maximum number of ions per mole when dissolved in water ?

Options

A. `K_(2)MgI_(4)`
B. `CuSO_(4)`
C. `FeCI_(3)`
D. `KI_(3)`

Answer

C

Explanation

`FeCI_(3)(aq.)rarr Fe^(3+)(aq.)+3CI^(-1)(aq.)`
`K_(2)HgI_(4)(aq.)rarr 2K^(+)(aq.)+HgI_(4)^(2-)(aq.)`
`CuSO_(4)rarr Cu^(2+)(aq.)+SO_(4)^(2-)(aq.)`
`KI_(3)rarr (aq.)+I_(3)^(-)(aq.)`
1 mmol of `FeCI_(3)` gives4 mol of ions. The strength of an electrolyte depends on the number of ions in solution and also on the charges on these ions.