A) 0.012
B) 0.015
C) 0.018
D) 2.0
Correct Answer: A
Solution :
Idea This problem is based on concept of V ant Hoff factor and dissociation constant. Students are advised to calculate V ant Hoff factor first followed by calculation of dissociation constant step by step. \[\Delta {{T}_{f}}={{K}_{f}}\times m\times i=0.39=i\times 1.86\times 0.1\] \[i\approx 2.1\] \[\underset{0}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,\xrightarrow{{}}\underset{c}{\mathop{{{H}^{+}}}}\,+\underset{c(1-\alpha )}{\mathop{HSO_{4}^{-}}}\,\] \[\underset{c(1-\alpha )}{\mathop{HSO_{4}^{-}}}\,\underset{c\alpha }{\mathop{{{H}^{+}}}}\,+\underset{c\alpha }{\mathop{SO_{4}^{-}}}\,\] TEST Edge Question involving concept of V ant Hoff factor and dissociation constant is asked in JEE Main generally. The question including calculation of \[p{{K}_{a}}\] may also be asked so students are advised to go through concept of \[p{{K}_{a}}\] also \[p{{K}_{a}}=-\log {{K}_{a}}\]
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