b
મોલાલીટી \( = \,\,\frac{{{\text{75}}{\text{.2}}}}{{{\text{94}}}}\,\,\,\Delta {T_f}\, = i{K_f}m\)

\(7\,\, = \,\,i\,\, \times \,14\,\, \times \,\,\frac{{75.2}}{{94}}\,\,\)

\( \Rightarrow \,\,\,\,i\,\, = \,\,\frac{{94}}{{75.2\,\, \times \,\,2}}\,\,\, = \,\,0.625\)

સંયોજન માટે  \(\,\,{\text{i}}\,\, = \,\,{\text{1}}\,\,{\text{ - }}\,\,\alpha \,\, + \,\,\frac{\alpha }{{\text{n}}}\)

ડાયમરાઝેશન માટે \({\text{;}}\,\,{\text{n}}\,\, = \,\,{\text{2}}\,\,\)

\(\therefore \,\,{\text{i}}\,\, = \,\,{\text{1}}\,\,{\text{ - }}\,\,\alpha \,\, + \,\,\frac{\alpha }{{\text{2}}}\,\, = \,\,1\,\, - \,\,\frac{\alpha }{2}\)

\(0.625\,\, = \,\,1\,\, - \,\,\frac{\alpha }{2}\,\,\)

\( \Rightarrow \,\,\frac{\alpha }{2}\,\, = \,\,1\,\, - \,\,0.625\)

\(\frac{\alpha }{2}\,\, = \,\,0.375\,\,\,\,\,\) \( \Rightarrow \,\,\,\,\alpha \,\, = \,\,0.75\)