Which aqueous solution has minimum freezing point?

Options

A. `0.01 M NaCl`
B. `0.005 M C_(2)H_(5)OH`
C. `0.005 M Mgl_(2)`
D. `0.005 M MgSO_(4)`

Answer

A

Explanation

Minimum freezing point means more number of ions
`0.01 xx 2 =0.02`
`0.005 xx 1 =0.005`
`0.005 xx 3 =0.015`
`0.005 xx 2 =0.01`