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For an ideal solution containing a nonvolatile solute, Which of the following expression is correctly represented ?

$\begin{array}{1 1} \Delta T_b=K_bm\;where\;K_b=M_t RT_b ^{+2}/\Delta _{vap} H_m \\ \Delta T_b=K_bm\;where\;K_b=RT_b^{+2}/M_1 \Delta _{vap} H_m \\ \Delta T_b=K_bm\;where\;K_b=M_t T_b ^{+2}/R\Delta _{vap} H_m \\ \Delta T_b=K_bm\;where\;K_b=M_t RT_b ^{+2}\Delta _{vap} H_m \end{array}$

Answer :$\Delta T_b=K_bm\;where\;K_b=M_t RT_b ^{+2}/\Delta _{vap} H_m$
The correct expressions are $\Delta T_b=K_bm$ and $K_b=M_t RT_b ^{+2}/\Delta _{vap} H_m$