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At 25^ C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm ⁻¹ ~cm ^2 ~mol ⁻¹ and at infinite dilution its molar conductance is 238 ohm ⁻¹ ~cm ^2 ~mol ⁻¹ . The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

Options

  1. A2.080 %
  2. B20.800 %
  3. C4.008 %
  4. D40.800 %

Correct answer

C. 4.008 %

Step-by-step solution

Given, molar conductance at 0.1 M concentration, _c=9.54 ⁻¹ ~cm ^2 ~mol ⁻¹ Molar conductance at infinite dilution, _c^ =238 ⁻¹ ~cm ^2 ~mol ⁻¹ We know that, degree of ionisation, aligned & = _c _c^ 100 & = 9.54 238 100=4.008 % aligned

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