Question

Specific conductance of 0.1 M HNO₃ is 6.3 × 10⁻² ohm⁻¹ cm⁻¹. The molar conductance of the solution is ______.

Options

• 100 ohm⁻¹ cm²

• 515 ohm⁻¹ cm²

• 630 ohm⁻¹ cm²

• 6300 ohm⁻¹ cm²

Answer 1

Specific conductance of 0.1 M HNO₃ is 6.3 × 10⁻² ohm⁻¹ cm⁻¹. The molar conductance of the solution is 630 ohm⁻¹ cm².

Explanation:

Molar conductance of a solution is related to specific conductance as follows:

`∧_m = κ xx 1000/"C"`  .....(a)

= `(6.3 xx 10^-2  ohm^-1  cm^-1) xx 1000/(0.1  mol//cm^3)`

= 6.3 × 10⁻² × 10⁴ ohm⁻¹ cm² mol⁻¹

= 630 ohm⁻¹ cm² mol⁻¹