Question

At 25°C molar conductance of 0.1 molar aqueous solution
of ammonium hydroxide is 9.54 ohm⁻¹ cm²mol⁻¹ and at infinite
dilution its molar conductance is 238 ohm-1 cm² mol⁻¹. The
degree or ionisation of ammonium hydroxide at the same
concentration and temperature is : [2013]
(a) 20.800% (b) 4.008%
(c) 40.800% (d) 2.080%

Answer 1

The degree or ionisation of ammonium hydroxide at the same

concentration and temperature is (α) = 4.008

option (B) is correct.

Explanation:

Degree of alpha (α) = Molar conductivity at concentration c / molar conductivity at infinite dilution

(α) = 9.54 Ω^-1 cm^2 mol-1 / 238 Ω^-1 cm^2 mol^-1

(α) = 0.04008

(α) = 4.008

Thus the degree or ionisation of ammonium hydroxide at the same

concentration and temperature is (α) = 4.008

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