question_answer

Y gm. of a non-volatile substance (molecular mass M) is dissolved in 250 gm of benzene. If \[{{K}_{b}}\] is the molal elevation constant the value of \[\Delta {{T}_{b}}\] is given by :-

A)  \[4M/{{K}_{b}}\,Y\]         

B)  \[4{{K}_{b}}.\,Y/M\]

C)  \[{{K}_{b}}.\,Y/4M\]         

D)  \[{{K}_{b}}.\,Y/M\]