A) 75
B) 60
C) 80
D) 70
Correct Answer: B
Solution :
van?t Hoff factor, \[i=\frac{\text{observed}\,\text{molar}\,\text{mass}}{\text{calculated}\,\text{molar}\,\text{mass}}\] \[=\frac{40}{25}=1.6\] Since, sodium hydroxide is binary electrolyte, \[i=[1+(2-1)\alpha ]\](\[\alpha =\]degree of ionisation) \[1.6=(1+\alpha )\] \[\alpha =1.6-1=0.6=60%\]You need to login to perform this action.
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