The molar mass of the solute, sodium hydroxide obtained from the measurement of the osmotic pressure of its aqueous solution at 27oC is 25 g mol-1 . Therefore, its ionisation percentage in this solution is
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a
75
b
60
c
80
d
70
answer is B.
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Detailed Solution
In case of ionisation of binary electrolyte Abnormal molecular mass Mnormal1+αAbnormal molecular mass = 25 g mol-1So,25=401+α⇒α=0.6 Ionisation percentage =0.6×100=60%