1.

A0.020 m solution of each of the following compounds is prepared. Which solution would you expect to freeze at -0.149 ""^@C ?

Answer»

`[Co(en)_2Cl_2]CL`
`NA[Co(EDTA)]`
`[Cr(py)_5CI]Cl_2`
`[Cr(NH_3)_6]Cl_3`

Solution :As we know ,
`DeltaT_(f) = i xx K_(f) xx m`
So,`T_(f-)^(@) - T_(f) =i xx K_(f) xx m`
0.149 ` = ixx 1.86 xx 0.020`
Hence , i=4
The compound having the VALUE of i=4 will have the freezing POINT `-0.149^(@)C` i.e , `[Cr(NH_3)_6]Cl_(3)`.


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