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At 25^(@)C molar conductivity of 0.1 mol...

At `25^(@)C` molar conductivity of 0.1 molar aqueous of ammonium hydroxide is `"9.54 ohm"^(-1)."cm"^(2)."mol"^(-1)` and at infinite dilution its molar conductivity is `"239 ohm"^(-1)."cm"^(2)."mol"^(-1)`. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is -

A

`40.800%`

B

`2.080%`

C

`20.800%`

D

`4.008%`

Text Solution

Verified by Experts

The correct Answer is:
D
degree of ionisation,
`alpha=(Lambda_(m))/(Lambda_(m)^(@))=(9.54)/(238)=0.04008=4.008%`
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