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The values of limiting ionic conductance...

The values of limiting ionic conductance of H+ and HCOO-  ions are respectively 347 and 53 S cm2 mol−1 at 298K. If the molar conductance of 0.025M methanoic acid at 298K  is 40 S cm2 mol-1 the dissociation constant of methanoic acid at 298K is

A

1×10−5

B

2×10−5

C

2.5×10−4

D

1.5×10−4

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