Q.

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%
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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